Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe1-xCoxAs

Jia-Xin Yin; Songtian S. Zhang; Guangyang Dai; Yuanyuan Zhao; Andreas Kreisel; Gennevieve Macam; Xianxin Wu; Hu Miao; Zhi-Quan Huang; Johannes H. J. Martiny; Brian M. Andersen; Nana Shumiya; Daniel Multer; Maksim Litskevich; Zijia Cheng; Xian Yang; Tyler A. Cochran; Guoqing Chang; Ilya Belopolski; Lingyi Xing; Xiancheng Wang; Yi Gao; Feng-Chuan Chuang; Hsin Lin; Ziqiang Wang; Changqing Jin; Yunkyu Bang; M. Zahid Hasan

doi:10.1103/PhysRevLett.123.217004

Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe_1-xCo_xAs

Jia-Xin Yin, Songtian S. Zhang, Guangyang Dai, Yuanyuan Zhao, Andreas Kreisel, Gennevieve Macam, Xianxin Wu, Hu Miao, Zhi-Quan Huang, Johannes H. J. Martiny, Brian M. Andersen, Nana Shumiya, Daniel Multer, Maksim Litskevich, Zijia Cheng, Xian Yang, Tyler A. Cochran, Guoqing Chang, Ilya Belopolski, Lingyi XingXiancheng Wang, Yi Gao, Feng-Chuan Chuang, Hsin Lin, Ziqiang Wang, Changqing Jin, Yunkyu Bang, M. Zahid Hasan

Xray and Neutron Science

7 Citations (Scopus)

Abstract

The interplay between unconventional Cooper pairing and quantum states associated with atomic scale defects is a frontier of research with many open questions. So far, only a few of the high-temperature superconductors allow this intricate physics to be studied in a widely tunable way. We use scanning tunneling microscopy to image the electronic impact of Co atoms on the ground state of the LiFe1-xCoxAs system. We observe that impurities progressively suppress the global superconducting gap and introduce low energy states near the gap edge, with the superconductivity remaining in the strong-coupling limit. Unexpectedly, the fully opened gap evolves into a nodal state before the Cooper pair coherence is fully destroyed. Our systematic theoretical analysis shows that these new observations can be quantitatively understood by the nonmagnetic Born-limit scattering effect in an s±-wave superconductor, unveiling the driving force of the superconductor to metal quantum phase transition.

Original language	English
Article number	217004
Journal	Physical Review Letters
Volume	123
Issue number	21
Number of pages	7
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.123.217004
Publication status	Published - 20 Nov 2019

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Yin, J.-X., Zhang, S. S., Dai, G., Zhao, Y., Kreisel, A., Macam, G., Wu, X., Miao, H., Huang, Z.-Q., Martiny, J. H. J., Andersen, B. M., Shumiya, N., Multer, D., Litskevich, M., Cheng, Z., Yang, X., Cochran, T. A., Chang, G., Belopolski, I., ... Hasan, M. Z. (2019). Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe_1-xCo_xAs. Physical Review Letters, 123(21), Article 217004. https://doi.org/10.1103/PhysRevLett.123.217004

Yin, J-X, Zhang, SS, Dai, G, Zhao, Y, Kreisel, A, Macam, G, Wu, X, Miao, H, Huang, Z-Q, Martiny, JHJ, Andersen, BM, Shumiya, N, Multer, D, Litskevich, M, Cheng, Z, Yang, X, Cochran, TA, Chang, G, Belopolski, I, Xing, L, Wang, X, Gao, Y, Chuang, F-C, Lin, H, Wang, Z, Jin, C, Bang, Y & Hasan, MZ 2019, 'Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe_1-xCo_xAs', Physical Review Letters, vol. 123, no. 21, 217004. https://doi.org/10.1103/PhysRevLett.123.217004

@article{2263121954924a13ba25f95b9bec99e6,

title = "Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe1-xCoxAs",

abstract = "The interplay between unconventional Cooper pairing and quantum states associated with atomic scale defects is a frontier of research with many open questions. So far, only a few of the high-temperature superconductors allow this intricate physics to be studied in a widely tunable way. We use scanning tunneling microscopy to image the electronic impact of Co atoms on the ground state of the LiFe1-xCoxAs system. We observe that impurities progressively suppress the global superconducting gap and introduce low energy states near the gap edge, with the superconductivity remaining in the strong-coupling limit. Unexpectedly, the fully opened gap evolves into a nodal state before the Cooper pair coherence is fully destroyed. Our systematic theoretical analysis shows that these new observations can be quantitatively understood by the nonmagnetic Born-limit scattering effect in an s±-wave superconductor, unveiling the driving force of the superconductor to metal quantum phase transition.",

author = "Jia-Xin Yin and Zhang, {Songtian S.} and Guangyang Dai and Yuanyuan Zhao and Andreas Kreisel and Gennevieve Macam and Xianxin Wu and Hu Miao and Zhi-Quan Huang and Martiny, {Johannes H. J.} and Andersen, {Brian M.} and Nana Shumiya and Daniel Multer and Maksim Litskevich and Zijia Cheng and Xian Yang and Cochran, {Tyler A.} and Guoqing Chang and Ilya Belopolski and Lingyi Xing and Xiancheng Wang and Yi Gao and Feng-Chuan Chuang and Hsin Lin and Ziqiang Wang and Changqing Jin and Yunkyu Bang and Hasan, {M. Zahid}",

year = "2019",

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doi = "10.1103/PhysRevLett.123.217004",

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T1 - Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe1-xCoxAs

AU - Yin, Jia-Xin

AU - Zhang, Songtian S.

AU - Dai, Guangyang

AU - Zhao, Yuanyuan

AU - Kreisel, Andreas

AU - Macam, Gennevieve

AU - Wu, Xianxin

AU - Miao, Hu

AU - Huang, Zhi-Quan

AU - Martiny, Johannes H. J.

AU - Andersen, Brian M.

AU - Shumiya, Nana

AU - Multer, Daniel

AU - Litskevich, Maksim

AU - Cheng, Zijia

AU - Yang, Xian

AU - Cochran, Tyler A.

AU - Chang, Guoqing

AU - Belopolski, Ilya

AU - Xing, Lingyi

AU - Wang, Xiancheng

AU - Gao, Yi

AU - Chuang, Feng-Chuan

AU - Lin, Hsin

AU - Wang, Ziqiang

AU - Jin, Changqing

AU - Bang, Yunkyu

AU - Hasan, M. Zahid

PY - 2019/11/20

Y1 - 2019/11/20

N2 - The interplay between unconventional Cooper pairing and quantum states associated with atomic scale defects is a frontier of research with many open questions. So far, only a few of the high-temperature superconductors allow this intricate physics to be studied in a widely tunable way. We use scanning tunneling microscopy to image the electronic impact of Co atoms on the ground state of the LiFe1-xCoxAs system. We observe that impurities progressively suppress the global superconducting gap and introduce low energy states near the gap edge, with the superconductivity remaining in the strong-coupling limit. Unexpectedly, the fully opened gap evolves into a nodal state before the Cooper pair coherence is fully destroyed. Our systematic theoretical analysis shows that these new observations can be quantitatively understood by the nonmagnetic Born-limit scattering effect in an s±-wave superconductor, unveiling the driving force of the superconductor to metal quantum phase transition.

AB - The interplay between unconventional Cooper pairing and quantum states associated with atomic scale defects is a frontier of research with many open questions. So far, only a few of the high-temperature superconductors allow this intricate physics to be studied in a widely tunable way. We use scanning tunneling microscopy to image the electronic impact of Co atoms on the ground state of the LiFe1-xCoxAs system. We observe that impurities progressively suppress the global superconducting gap and introduce low energy states near the gap edge, with the superconductivity remaining in the strong-coupling limit. Unexpectedly, the fully opened gap evolves into a nodal state before the Cooper pair coherence is fully destroyed. Our systematic theoretical analysis shows that these new observations can be quantitatively understood by the nonmagnetic Born-limit scattering effect in an s±-wave superconductor, unveiling the driving force of the superconductor to metal quantum phase transition.

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DO - 10.1103/PhysRevLett.123.217004

M3 - Journal article

C2 - 31809171

SN - 0031-9007

VL - 123

JO - Physical Review Letters

JF - Physical Review Letters

IS - 21

M1 - 217004

ER -

Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe1-xCoxAs

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Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe_1-xCo_xAs