Impact of iron-site defects on superconductivity in LiFeAs

Chi, Shun; Aluru, Ramakrishna; Singh, Udai Raj; Liang, Ruixing; Hardy, Walter N.; Bonn, D. A.; Kreisel, A.; Andersen, Brian M.; Nelson, R.; Berlijn, T.; Ku, W.; Hirschfeld, P. J.; Wahl, Peter

doi:10.1103/PhysRevB.94.134515

Title: Impact of iron-site defects on superconductivity in LiFeAs

Journal Article · Wed Oct 19 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.134515· OSTI ID:1393900

Chi, Shun ^[1]; Aluru, Ramakrishna ^[2]; Singh, Udai Raj ^[3]; Liang, Ruixing ^[1]; Hardy, Walter N. ^[1]; Bonn, D. A. ^[1]; Kreisel, A. ^[4]; Andersen, Brian M. ^[4]; Nelson, R. ^[5]; Berlijn, T. ^[6]; Ku, W. ^[7]; Hirschfeld, P. J. ^[8]; Wahl, Peter ^[2]

Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Physics and Astronomy, Quantum Matter Inst.
Max Planck Inst. for Solid State Research, Stuttgart (Germany); Univ. of St. Andrews, Scotland (United Kingdom). School of Physics and Astronomy
Max Planck Inst. for Solid State Research, Stuttgart (Germany)
Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science, Computer Science and Mathematics Division
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Department (CMPMSD); Shanghai Jiao Tong Univ. (China). Dept. of Physics and Astronomy
Univ. of Florida, Gainesville, FL (United States). Dept. of Physics

In conventional s -wave superconductors, only magnetic impurities exhibit impurity bound states, whereas for an s_± order parameter they can occur for both magnetic and nonmagnetic impurities. Impurity bound states in superconductors can thus provide important insight into the order parameter. We present a combined experimental and theoretical study of native and engineered iron-site defects in LiFeAs. A detailed comparison of tunneling spectra measured on impurities with spin-fluctuation theory reveals a continuous evolution from negligible impurity-bound-state features for weaker scattering potential to clearly detectable states for somewhat stronger scattering potentials. Furthermore, all bound states for these intermediate strength potentials are pinned at or close to the gap edge of the smaller gap, a phenomenon that we explain and ascribe to multiorbital physics.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; DMR-1407502

OSTI ID:: 1393900

Alternate ID(s):: OSTI ID: 1329342

Journal Information:: Physical Review B, Vol. 94, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Lifthitz Transition and Shadow Gap in Li(Fe1−xCox)As Investigated by STM/STS Liu, Ruizhe; Ye, Zhiyang; Wang, Jihui Journal of Superconductivity and Novel Magnetism, Vol. 32, Issue 12 https://doi.org/10.1007/s10948-019-5123-3	journal	June 2019
Imaging the real space structure of the spin fluctuations in an iron-based superconductor Chi, Shun; Aluru, Ramakrishna; Grothe, Stephanie Nature Communications, Vol. 8, Issue 1 https://doi.org/10.1038/ncomms15996	journal	June 2017
Discovery of a strain-stabilised smectic electronic order in LiFeAs Yim, Chi Ming; Trainer, Christopher; Aluru, Ramakrishna Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-04909-y	journal	July 2018
Study of intrinsic defect states of FeSe with scanning tunneling microscopy Bu, Kunliang; Wang, Bo; Zhang, Wenhao Physical Review B, Vol. 100, Issue 15 https://doi.org/10.1103/physrevb.100.155127	journal	October 2019
Detecting sign-changing superconducting gap in LiFeAs using quasiparticle interference Altenfeld, D.; Hirschfeld, P. J.; Mazin, I. I. Physical Review B, Vol. 97, Issue 5 https://doi.org/10.1103/physrevb.97.054519	journal	February 2018
Discovery of orbital-selective Cooper pairing in FeSe Sprau, P. O.; Kostin, A.; Kreisel, A. Science, Vol. 357, Issue 6346 https://doi.org/10.1126/science.aal1575	journal	July 2017
Theoretical study of impurity-induced magnetism in FeSe Martiny, Johannes H. J.; Kreisel, Andreas; Andersen, Brian M. arXiv https://doi.org/10.48550/arxiv.1811.01788	text	January 2018

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