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

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

doi:10.1103/physrevlett.123.217004

Title: Quantum Phase Transition of Correlated Iron-Based Superconductivity in ${LiFe}_{1 - x} {Co}_{x} As$

Journal Article · Wed Nov 20 00:00:00 EST 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.123.217004· OSTI ID:1632131

^[1]; Zhang, Songtian S. ^[1]; Dai, Guangyang ^[2]; Zhao, Yuanyuan ^[3]; Kreisel, Andreas ^[4]; Macam, Gennevieve ^[5]; Wu, Xianxin ^[6]; Miao, Hu ^[7]; Huang, Zhi-Quan ^[5]; Martiny, Johannes H. J. ^[8]; Andersen, Brian M. ^[9]; Shumiya, Nana ^[1]; Multer, Daniel ^[1]; Litskevich, Maksim ^[1]; Cheng, Zijia ^[1]; Yang, Xian ^[1]; Cochran, Tyler A. ^[1]; Chang, Guoqing ^[1]; Belopolski, Ilya ^[1]; Xing, Lingyi ^[2] more »

Princeton Univ., NJ (United States). Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7)
Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics
Nanjing University of Information Science and Technology, Nanjing (China)
Universität Leipzig, Leipzig (Germany)
National Sun Yat-Sen University, Kaohsiung (Taiwan)
Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; Julius-Maximilians-Universität Würzburg, Würzburg (Germany)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Technical Univ. of Denmark, Lyngby (Denmark). Center for Nanostructured Graphene (CNG)
Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
Nanjing Normal University, Nanjing (China). Center for Quantum Transport and Thermal Energy Science, Jiangsu Key Lab on Opto-Electronic Technology
Academia Sinica, Taipei (Taiwan). Institute of Physics
Boston College, Chestnut Hill, MA (United States)
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Asia Pacific Center for Theoretical Physics
Princeton Univ., NJ (United States). Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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 LiFe$$_{1-x}Co_{x}$$ As 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. Here, 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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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation (GBMF); Natural Science Foundation from Jiangsu Province of China

Grant/Contract Number:: AC02-05CH11231; FG02-05ER46200; FG02-99ER45747; 2016-R1A2B4-008758; BK20160094

OSTI ID:: 1632131

Journal Information:: Physical Review Letters, Vol. 123, Issue 21; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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Title: Quantum Phase Transition of Correlated Iron-Based Superconductivity in ${LiFe}_{1 - x} {Co}_{x} As$