Kim Lefmann

2019

Dipolar spin ice under uniaxial pressure

Edberg, R., Sandberg, L. O., Bakke, I. M. B., Haubro, M. L., Folkers, L. C., Mangin-Thro, L., Wildes, A., Zaharko, O., Guthrie, M., Holmes, A. T., Sorby, M. H., Lefmann, K., Deen, P. P. & Henelius, P., 25 Oct 2019, In: Physical Review B. 100, 14, 8 p., 144436.

Research output: Contribution to journal › Journal article › Research › peer-review

5 Citations (Scopus)

Exact diagonalization study of the Hubbard-parametrized four-spin ring exchange model on a square lattice

Larsen, C. B., Rømer, A. T., Janas, S., Treue, F., Mønsted, B., Shaik, N. E., Rønnow, H. M. & Lefmann, K., 27 Feb 2019, In: Physical Review B. 99, 5, 12 p., 054432.

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

2018

24-spin clusters in the mineral boleite KPb₂₆Ag₉Cu₂₄Cl₆₂(OH)₄₈

Dreier, E. S., Holm, S. L., Lonbaek, K., Hansen, U. B., Medarde, M., Zivkovic, I., Babkevich, P., Ruminy, M., Casati, N., Piovano, A., Rols, S., Nilsen, G. J., Boehm, M., Skoulatos, M., Schefer, J., Ronnow, H. M., Fennell, T. & Lefmann, K., 17 Jan 2018, In: Physical Review B. 97, 1, 014416.

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

Chemical tunnel-splitting-engineering in a dysprosium-based molecular nanomagnet

Sørensen, M. A., Hansen, U. B., Perfetti, M., Pedersen, K. S., Bartolome, E., Simeoni, G. G., Mutka, H., Rols, S., Jeong, M., Zivkovic, I., Retuerto Millan, M., Arauzo, A., Bartolome, J., Piligkos, S., Weihe, H., Doerrer, L. H., van Slageren, J., Rønnow, H. M., Lefmann, K. & Bendix, J., 1 Dec 2018, In: Nature Communications. 9, 9 p., 1292.

Research output: Contribution to journal › Journal article › Research › peer-review

34 Citations (Scopus)

123 Downloads (Pure)

Distinct Nature of Static and Dynamic Magnetic Stripes in Cuprate Superconductors

Jacobsen, H., Holm, S. L., Lacatusu, M. -E., Romer, A. T., Bertelsen, M., Boehm, M., Toft-Petersen, R., Grivel, J. -C., Emery, S. B., Udby, L., Wells, B. O. & Lefmann, K., 18 Jan 2018, In: Physical Review Letters. 120, 3, 5 p., 037003.

Research output: Contribution to journal › Journal article › Research › peer-review

7 Citations (Scopus)

Erratum: Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO3

Holm-Dahlin, S., Kreisel, A., Schäffer, T. K., Bakke, A., Bertelsen, M., Hansen, U. B., Retuerto, M., Larsen, J., Prabhakaran, D., Deen, P. P., Yamani, Z., Birk, J. O., Stuhr, U., Niedermayer, C., Fennell, A. L., Andersen, B. M. & Lefmann, K., 17 Sept 2018, In: Physical Review B. 97, 9, 134304.

Research output: Contribution to journal › Comment/debate › Research › peer-review

Magnetic Anisotropy Switch: Easy Axis to Easy Plane Conversion and Vice Versa

Perfetti, M., Sørensen, M. A., Hansen, U. B., Bamberger, H., Lenz, S., Hallmen, P. P., Fennell, T., Simeoni, G. G., Arauzo, A., Bartolome, J., Bartolome, E., Lefmann, K., Weihe, H., van Slageren, J. & Bendix, J., 8 Aug 2018, In: Advanced Functional Materials. 28, 32, 8 p., 1801846.

Research output: Contribution to journal › Journal article › Research › peer-review

11 Citations (Scopus)

Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO₃

Holm-Dahlin, S., Kreisel, A., Schäffer, T. K., Bakke, A., Bertelsen, M., Hansen, U. B., Retuerto Millan, M., Larsen, J., Prabhakaran, D., Deen, P. P., Yamani, Z., Birk, J. O., Stuhr, U., Niedermayer, C., Fennell, A. L., Andersen, B. M. & Lefmann, K., 17 Apr 2018, In: Physical Review B. 97, 13, 11 p., 134304 .

Research output: Contribution to journal › Journal article › Research › peer-review

11 Citations (Scopus)

Neutron imaging study of 'pattern-welded' swords from the Viking Age

Fedrigo, A., Strobl, M., Williams, A. R., Lefmann, K., Lindelof, P. E., Jørgensen, L., Pentz, P., Bausenwein, D., Schillinger, B., Kovyakh, A. & Grazzi, F., 1 Sept 2018, In: Archaeological and Anthropological Sciences. 10, 6, p. 1249-1263 15 p.

Research output: Contribution to journal › Journal article › Research › peer-review

5 Citations (Scopus)

Optimizing neutron guides: CoatingWriter

Olsen, M. A., Bertelsen, M. & Lefmann, K., 12 Dec 2018, In: Journal of Neutron Research. 20, 4, p. 137-139

Research output: Contribution to journal › Journal article › Research › peer-review

Prototype of the novel CAMEA concept—A backend for neutron spectrometers

Marko, M., Groitl, F., Lass, J., Birk, J. O., Freeman, P., Lefmann, K., Christensen, N. B., Niedermayer, C., Juranyi, F., Lass, J., Hansen, A. & Rønnow, H. M., 1 Jan 2018, In: Review of Scientific Instruments. 89, 1, 13 p., 015105.

Research output: Contribution to journal › Journal article › Research › peer-review

2 Citations (Scopus)

2017

An optional focusing SELENE extension to conventional neutron guides: A case study for the ESS instrument BIFROST

Hansen, U. B., Bertelsen, M., Stahn, J. & Lefmann, K., 21 Apr 2017, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 852, p. 46-56

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

Extraction of archaeological information from metallic artefacts-A neutron diffraction study on Viking swords

Fedrigo, A., Grazzi, F., Williams, A. R., Panzner, T., Lefmann, K., Lindelof, P. E., Jørgensen, L., Pentz, P., Scherillo, A., Porcher, F. & Strobl, M., 1 Apr 2017, In: Journal of Archaeological Science: Reports. 12, p. 425-436 12 p.

Research output: Contribution to journal › Journal article › Research › peer-review

5 Citations (Scopus)

Off-axis spin orientation in goethite nanoparticles

Brok, E., Lefmann, K., Nilsen, G. J., Kure, M. & Frandsen, C., 19 Sept 2017, In: Physical Review B. 96, 10, 104426.

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl₂ center dot 2D₂O in a transverse field

Larsen, J., Schaffer, T. K., Hansen, U. B., Holm, S. L., Ahl, S. R., Toft-Petersen, R., Taylor, J., Ehlers, G., Jensen, J., Ronnow, H. M., Lefmann, K. & Christensen, N. B., 20 Nov 2017, In: Physical Review B. 96, 17, 174424.

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

Spin orientation in solid solution hematite-ilmenite

Brok, E., Frandsen, C., Lefmann, K., McEnroe, S., Robinson, P., Burton-Pye, B. P., Hansen, T. C. & Harrison, R., 1 Jun 2017, In: American Mineralogist. 102, 6, p. 1234-1243 10 p.

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

50 Downloads (Pure)

Spin susceptibility of the topological superconductor UPt₃ from polarized neutron diffraction

Gannon, W. J., Halperin, W. P., Eskildsen, M. R., Dai, P., Hansen, U. B., Lefmann, K. & Stunault, A., 10 Jul 2017, In: Physical Review B. 96, 4, 041111.

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

Staging superstructures in high-T_c Sr/O codoped La_2-xSr_xCuO_4+y

Ray, P. J., Andersen, N. H., Jensen, T. B. S., Mohottala, H. E., Niedermayer, C., Lefmann, K., v.Zimmermann, M. & Udby, L., 9 Nov 2017, In: Physical Review B. 96, 6 p., 174106.

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

Zero-order filter for diffractive focusing of de Broglie matter waves

Eder, S. D., Ravn, A. K., Samelin, B., Bracco, G., Palau, A. S., Reisinger, T., Knudsen, E. S., Lefmann, K. & Holst, B., 21 Feb 2017, In: Physical Review A. 95, 2, 5 p., 023618.

Research output: Contribution to journal › Journal article › Research › peer-review

8 Citations (Scopus)

2016

Constraining neutron guide optimizations with phase-space considerations

Bertelsen, M. & Lefmann, K., 11 Sept 2016, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 830, p. 313-324

Research output: Contribution to journal › Journal article › Research › peer-review

7 Citations (Scopus)

HEIMDAL: A thermal neutron powder diffractometer with high and flexible resolution combined with SANS and neutron imaging - Designed for materials science studies at the European Spallation Source

Holm, S. L., Lefmann, K., Henry, P. F., Bertelsen, M., Schefer, J. & Christensen, M., 21 Aug 2016, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 828, p. 229-241

Research output: Contribution to journal › Journal article › Research › peer-review

7 Citations (Scopus)

Neutron guide shielding for the BIFROST spectrometer at ESS

Mantulnikovs, K., Bertelsen, M., Cooper-jensen, C. P., Lefmann, K. & Klinkby, E. B., 10 Oct 2016, In: Journal of Physics - Conference Series. 746, 1, 012027.

Research output: Contribution to journal › Conference article › Research › peer-review

1 Citation (Scopus)

154 Downloads (Pure)

Optimizing a neutron-beam focusing device for the direct geometry time-of-flight spectrometer TOFTOF at the FRM II reactor source

Rasmussen, N. G., Simeoni, G. G. & Lefmann, K., 2016, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 816, p. 106-112 7 p.

Research output: Contribution to journal › Journal article › Research › peer-review

2 Citations (Scopus)

Simulating X-ray telescopes with McXtrace: A case study of ATHENA's optics

Ferreira, D. D. M., Knudsen, E. B., Westergaard, N. J., Christensen, F. E., Massahi, S., Shortt, B., Spiga, D., Solstad, M. & Lefmann, K., 26 Jun 2016, In: Proceedings of S P I E - International Society for Optical Engineering. 9905, UNSP 990576.

Research output: Contribution to journal › Conference article › Research › peer-review

3 Citations (Scopus)

Simulation of waviness in neutron guides

Hansen, U. B., Bertelsen, M., Lefmann, K. & Bergbäck Knudsen, E., 2016, In: Journal of Neutron Research. 18, 2-3, 45-59.

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

VESPA: The vibrational spectrometer for the European Spallation Source

Fedrigo, A., Colognesi, D., Bertelsen, M., Hartl, M., Lefmann, K., Deen, P. P., Strobl, M., Grazzi, F. & Zoppi, M., 1 Jun 2016, In: Review of Scientific Instruments. 87, 6, 065101.

Research output: Contribution to journal › Journal article › Research › peer-review

9 Citations (Scopus)

2015

Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO₄

Toft-Petersen, R., Reehuis, M., Jensen, T. B. S., Andersen, N. H., Li, J., Le, M. D., Laver, M., Niedermayer, C., Klemke, B., Lefmann, K. & Vaknin, D., 6 Jul 2015, In: Physical Review B. 92, 2, 9 p., 024404.

Research output: Contribution to journal › Journal article › Research › peer-review

27 Citations (Scopus)

24 Downloads (Pure)

CAMEA ESS - The Continuous Angle Multi-Energy Analysis Indirect Geometry Spectrometer for the European Spallation Source

Freeman, P. G., Birk, J. O., Marko, M., Bertelsen, M., Christensen, N. B., Lefmann, K., Jacobsen, J., Niedermayer, C., Juranyi, F. & Ronnow, H. M., 23 Jan 2015, In: Journal of Physics: Conference Series (Online). 83, 7 p., 03005.

Research output: Contribution to journal › Conference article › Research › peer-review

16 Citations (Scopus)

Competing superconducting and magnetic order parameters and field-induced magnetism in electron-doped Ba(Fe1-xCox)(2)As-2

Larsen, J., Uranga, B. M., Stieper, G., Holm, S. L., Bernhard, C., Wolf, T., Lefmann, K., Andersen, B. M. & Niedermayer, C., 13 Jan 2015, In: Physical Review B. 91, 2, 025404.

Research output: Contribution to journal › Journal article › Research › peer-review

7 Citations (Scopus)

Dynamic rotor mode in antiferromagnetic nanoparticles

Lefmann, K., Garde, J., Jacobsen, H., Hedegård, P., Ancona, S. N., Bahl, C. R. H. & Kuhn, L. T., 19 Mar 2015, In: Physical Review B. 91, 10 p., 094421.

Research output: Contribution to journal › Journal article › Research › peer-review

1 Citation (Scopus)

Field-induced interplanar magnetic correlations in the high-temperature superconductor La_1.88Sr_0.12CuO₄

Rømer, A. T., Ray, P., Jacobsen, H., Udby, L., Andersen, B. M., Bertelsen, M., Holm, S. L., Christensen, N. B., Toft-Petersen, R., Skoulatos, M., Laver, M., Schneidewind, A., Link, P., Oda, M., Ido, M., Nomono, N. & Lefmann, K., 11 May 2015, In: Physical Review B. 91, 174507.

Research output: Contribution to journal › Journal article › Research › peer-review

2 Citations (Scopus)

Neutron guide-split: A high performance guide bundle concept for elliptical guides

Holm, S. L., Rasmussen, N., Høpfner, L., Bertelsen, M., Voigt, J., Andersen, K. H. & Lefmann, K., 11 May 2015, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 782, p. 1-8

Research output: Contribution to journal › Journal article › Research › peer-review

Polarized neutron powder diffraction studies of antiferromagnetic order in bulk and nanoparticle NiO

Brok, E., Lefmann, K., Deen, P. P., Lebech, B., Jacobsen, H., G., N. & Frandsen, C., 26 Jan 2015, In: Physical Review B. 91, 014431.

Research output: Contribution to journal › Journal article › Research › peer-review

10 Citations (Scopus)

Prediction of beam hardening artefacts in computed tomography using Monte Carlo simulations

Thomsen, M., Knudsen, E. B., Willendrup, P. K., Bech, M., Willner, M., Pfeiffer, F., Poulsen, M., Lefmann, K. & Feidenhans'l, R. K., 1 Jan 2015, In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 342, p. 314-320 7 p.

Research output: Contribution to journal › Journal article › Research › peer-review

7 Citations (Scopus)

2014

A compact time-of-flight SANS instrument optimised for measurements of small sample volumes at the European Spallation Source

Kynde, S., Kleno, K. H., Nagy, G., Mortensen, K., Lefmann, K., Kohlbrecher, J. & Arleth, L., 11 Nov 2014, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 764, p. 133-141

Research output: Contribution to journal › Journal article › Research › peer-review

6 Citations (Scopus)

Corrigendum to "Bi-spectral extraction through elliptic neutron guides " [Nucl.Inst.and Meth A717(2013) 69-76]

Jacobsen, H., Lieutenant, K., Zendlle, C. & Lefmann, K., 11 Apr 2014, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 743, 160-160.

Research output: Contribution to journal › Comment/debate › Research › peer-review

1 Citation (Scopus)

Experimental evidence for lamellar magnetism in hemo-ilmenite by polarized neutron scattering

Brok, E., Sales, M., Lefmann, K., Kuhn, L. T., Schmidt, W. F., Roessli, B., McEnroe, S. A. & Harrison, R. J., 26 Feb 2014, In: Physical Review B. 89, 054430.

Research output: Contribution to journal › Journal article › Research › peer-review

6 Citations (Scopus)

Investigation of propagation algorithms for ray-tracing simulation of polarized neutrons

Knudsen, E. B., Rømer, A. T., Willendrup, P. K., Christiansen, P. & Lefmann, K., 1 Jan 2014, In: Journal of Neutron Research. 17, 1, p. 27-34

Research output: Contribution to journal › Journal article › Research › peer-review

4 Citations (Scopus)

Magnetic properties of nano-scale hematite, α-Fe₂O₃, studied by time-of-flight inelastic neutron spectroscopy

Hill, A. H., Jacobsen, H., Ross Stewart, J., Jiao, F., Jensen, N. P., Holm, S. L., Mutka, H., Seydel, T., Harrison, A. & Lefmann, K., 25 Jan 2014, In: Journal of Chemical Physics. 140, 044709.

Research output: Contribution to journal › Journal article › Research › peer-review

Magnetic properties of ultra-small goethite nanoparticles

Brok, E., Frandsen, C., Madsen, D. E., Jacobsen, H., Birk, J. O., Lefmann, K., Bendix, J., Pedersen, K. S., Boothroyd, C. B., Berhe, A. A., Simeoni, G. G. & Mørup, S., 10 Sept 2014, In: Journal of Physics D: Applied Physics. 47, 36, 365003.

Research output: Contribution to journal › Journal article › Research › peer-review

26 Citations (Scopus)

McStas: Past, present and future

Willendrup, P. K., Farhi, E., Knudsen, E., Filges, U. & Lefmann, K., 19 Feb 2014, In: Journal of Neutron Research. 17, 1, p. 35-43

Research output: Contribution to journal › Journal article › Research › peer-review

42 Citations (Scopus)

New developments in the McStas neutron instrument simulation package

Willendrup, P. K., Knudsen, E. B., Klinkby, E. B., Nielsen, T. N., Farhi, E., Filges, U. & Lefmann, K., 1 Aug 2014, In: Journal of Physics: Conference Series (Online). 528, 1, 012035.

Research output: Contribution to journal › Journal article › Research › peer-review

8 Citations (Scopus)

Prismatic analyzer concept for neutron spectrometers

Birk, J. O., Marko, M., Freeman, P. G., Jacobsen, J., Hansen, R. L., Niedermayer, C., Christensen, N. B., Måsson, M., Rønnow, H. M. & Lefmann, K., 1 Nov 2014, In: Review of Scientific Instruments. 85, 11, 113908.

Research output: Contribution to journal › Journal article › Research › peer-review

13 Citations (Scopus)

Simulations of chopper jitter at the LET neutron spectrometer at the ISIS TS2

Klenø, K. H., Lefmann, K., Willendrup, P. K., Christiansen, P. & Bewley, R., 9 Apr 2014, In: Journal of Neutron Research. 17, 2, p. 77-85

Research output: Contribution to journal › Journal article › Research › peer-review

Special Issue: Workshop on the Monte Carlo Simulation of Neutron Scattering Instruments MCNSI7

Lefmann, K. & Šaroun, J., 1 Jan 2014, In: Journal of Neutron Research. 17, 1, p. 3-3

Research output: Contribution to journal › Journal article › Research › peer-review

Visualisation by high resolution synchrotron X-ray phase contrast micro-tomography of gas films on submerged superhydrophobic leaves

Lauridsen, T., Glavina, K., Colmer, T. D., Winkel, A., Irvine, S., Lefmann, K., Feidenhans'l, R. K. & Pedersen, O., 1 Oct 2014, In: Journal of Structural Biology. 188, 1, p. 61-70

Research output: Contribution to journal › Journal article › Research › peer-review

12 Citations (Scopus)

2013

50 Years of Swiss Neutron Diffraction Instrumentation

Fischer, P., Schefer, J., Keller, L., Zaharko, O., Pomjakushin, V., Aliouane, N., Frontzek, M., Holm, S. L., Lefmann, K. & Christensen, M., 2 Aug 2013, In: Swiss Neutron News. 42, p. 4-15 11 p.

Research output: Contribution to journal › Journal article › Research

1038 Downloads (Pure)

A Monte Carlo Simulation of Neutron Instrument Resolution Functions: Proceedings of 10th International Conference on Quasielastic Neutron Scattering and 5th Workshop on Inelastic Neutron Spectrometers

Vickery, A., Udby, L., Violini, N., Voigt, J., Deen, P. P. & Lefmann, K., 12 Nov 2013, In: Journal of the Physical Society of Japan. 82, Supplement A , p. SA037 9 p.

Research output: Contribution to journal › Conference article › Research › peer-review

Bi-spectral extraction through elliptic neutron guides

Jacobsen, H., Lieutenant, K., Zendlle, C. & Lefmann, K., 21 Jul 2013, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 717, p. 69-76

Research output: Contribution to journal › Journal article › Research › peer-review

16 Citations (Scopus)

E-learning neutron scattering

Udby, L., Jensen, P., Lefmann, K., Bruun, J., Willendrup, P. K., Nielsen, J. S. B., Schober, H., Neuhaus, J. & Pulz, J., 1 Feb 2013, In: Neutron News. 24, 1, p. 18-23 6 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Kim Lefmann

Research output

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