S=1/2 ising behavior in the two-dimensional molecular magnet Fe(NCS) 2(pyrazine)2

H. N. Bordallo; L. Chapon; J. L. Manson; J. Hernández-Velasco; D. Ravot; W. M. Reiff; D. N. Argyriou

doi:10.1103/PhysRevB.69.224405

S=1/2 ising behavior in the two-dimensional molecular magnet Fe(NCS) ₂(pyrazine)₂

H. N. Bordallo^*, L. Chapon, J. L. Manson, J. Hernández-Velasco, D. Ravot, W. M. Reiff, D. N. Argyriou

^*Corresponding author af dette arbejde

22 Citationer (Scopus)

Abstract

The magnetic ordering and critical behavior of antiferromagnetic Fe(NCS)₂(pyrazine)₂ has been studied by neutron powder diffraction (NPD), inelastic neutron scattering (INS), Mössbauer spectroscopy, and magnetic measurements. The system can be regarded as a two-dimensional (2D) antiferromagnet even in the ordered phase, given that long-range magnetic ordering between the layers simply follows a necessary consequence of the establishment of long-range ordering within the planes. The INS data, which were taken on a cold neutron time-of-flight spectrometer, reveals that when the temperature is lowered towards T_N, the correlation length within the 2D layers increases and ultimately crosses over from two- to three-dimensional (3D) behavior. Indeed, 3D long-range antiferromagnetic order, associated with a propagation vector [1,0,1/4+ε], is observed in the NPD data below 6.8 K. Furthermore, in agreement with the behavior of both χ(T) and C_m(T) data, the order parameter follows the exact Osanger solution for a 2D S=1/2, Ising system.

Originalsprog	Engelsk
Artikelnummer	224405
Tidsskrift	Physical Review B - Condensed Matter and Materials Physics
Vol/bind	69
Udgave nummer	22
ISSN	0163-1829
DOI	https://doi.org/10.1103/PhysRevB.69.224405
Status	Udgivet - 1 jun. 2004
Udgivet eksternt	Ja

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Citationsformater

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title = "S=1/2 ising behavior in the two-dimensional molecular magnet Fe(NCS) 2(pyrazine)2",

abstract = "The magnetic ordering and critical behavior of antiferromagnetic Fe(NCS)2(pyrazine)2 has been studied by neutron powder diffraction (NPD), inelastic neutron scattering (INS), M{\"o}ssbauer spectroscopy, and magnetic measurements. The system can be regarded as a two-dimensional (2D) antiferromagnet even in the ordered phase, given that long-range magnetic ordering between the layers simply follows a necessary consequence of the establishment of long-range ordering within the planes. The INS data, which were taken on a cold neutron time-of-flight spectrometer, reveals that when the temperature is lowered towards TN, the correlation length within the 2D layers increases and ultimately crosses over from two- to three-dimensional (3D) behavior. Indeed, 3D long-range antiferromagnetic order, associated with a propagation vector [1,0,1/4+ε], is observed in the NPD data below 6.8 K. Furthermore, in agreement with the behavior of both χ(T) and Cm(T) data, the order parameter follows the exact Osanger solution for a 2D S=1/2, Ising system.",

author = "Bordallo, {H. N.} and L. Chapon and Manson, {J. L.} and J. Hern{\'a}ndez-Velasco and D. Ravot and Reiff, {W. M.} and Argyriou, {D. N.}",

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T1 - S=1/2 ising behavior in the two-dimensional molecular magnet Fe(NCS) 2(pyrazine)2

AU - Bordallo, H. N.

AU - Chapon, L.

AU - Manson, J. L.

AU - Hernández-Velasco, J.

AU - Ravot, D.

AU - Reiff, W. M.

AU - Argyriou, D. N.

PY - 2004/6/1

Y1 - 2004/6/1

N2 - The magnetic ordering and critical behavior of antiferromagnetic Fe(NCS)2(pyrazine)2 has been studied by neutron powder diffraction (NPD), inelastic neutron scattering (INS), Mössbauer spectroscopy, and magnetic measurements. The system can be regarded as a two-dimensional (2D) antiferromagnet even in the ordered phase, given that long-range magnetic ordering between the layers simply follows a necessary consequence of the establishment of long-range ordering within the planes. The INS data, which were taken on a cold neutron time-of-flight spectrometer, reveals that when the temperature is lowered towards TN, the correlation length within the 2D layers increases and ultimately crosses over from two- to three-dimensional (3D) behavior. Indeed, 3D long-range antiferromagnetic order, associated with a propagation vector [1,0,1/4+ε], is observed in the NPD data below 6.8 K. Furthermore, in agreement with the behavior of both χ(T) and Cm(T) data, the order parameter follows the exact Osanger solution for a 2D S=1/2, Ising system.

AB - The magnetic ordering and critical behavior of antiferromagnetic Fe(NCS)2(pyrazine)2 has been studied by neutron powder diffraction (NPD), inelastic neutron scattering (INS), Mössbauer spectroscopy, and magnetic measurements. The system can be regarded as a two-dimensional (2D) antiferromagnet even in the ordered phase, given that long-range magnetic ordering between the layers simply follows a necessary consequence of the establishment of long-range ordering within the planes. The INS data, which were taken on a cold neutron time-of-flight spectrometer, reveals that when the temperature is lowered towards TN, the correlation length within the 2D layers increases and ultimately crosses over from two- to three-dimensional (3D) behavior. Indeed, 3D long-range antiferromagnetic order, associated with a propagation vector [1,0,1/4+ε], is observed in the NPD data below 6.8 K. Furthermore, in agreement with the behavior of both χ(T) and Cm(T) data, the order parameter follows the exact Osanger solution for a 2D S=1/2, Ising system.

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