Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide FeSe0.45Te0.55

Sarkar, Saheli; Van Dyke, John; Sprau, Peter O.; Massee, Freek; Welp, Ulrich; Kwok, Wai-Kwong; Davis, J. C.  Seamus; Morr, Dirk K.

doi:10.1103/PhysRevB.96.060504

Title: Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide ${FeSe}_{0.45} {Te}_{0.55}$

Journal Article · Wed Aug 09 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.060504· OSTI ID:1412748

Sarkar, Saheli ^[1]; Van Dyke, John ^[2]; Sprau, Peter O. ^[3]; Massee, Freek ^[4]; Welp, Ulrich ^[5]; Kwok, Wai-Kwong ^[5]; Davis, J. C. Seamus ^[6]; Morr, Dirk K. ^[1]

Univ. of Illinois, Chicago, IL (United States)
Univ. of Illinois, Chicago, IL (United States); Iowa State Univ., Ames, IA (United States)
Cornell Univ., Ithaca, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Cornell Univ., Ithaca, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. Paris-Saclay, Gif-sur-Yvette (France)
Argonne National Lab. (ANL), Argonne, IL (United States)
Cornell Univ., Ithaca, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of St. Andrews, Scotland (United Kingdom); Univ. College Cork (Ireland)

We demonstrate that the differential conductance, dI/dV , measured via spectroscopic imaging scanning tunneling microscopy in the doped iron chalcogenide FeSe0.45Te0.55, possesses a series of characteristic features that allow one to extract the orbital structure of the superconducting gaps. This yields nearly isotropic superconducting gaps on the two hole-like Fermi surfaces, and a strongly anisotropic gap on the electron-like Fermi surface. Moreover, we show that the pinning of nematic fluctuations by defects can give rise to a dumbbell-like spatial structure of the induced impurity bound states, and explains the related C₂-symmetry in the Fourier transformed differential conductance.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; 2009-BNL-PM015; FG02-05ER46225

OSTI ID:: 1412748

Alternate ID(s):: OSTI ID: 1374652

Report Number(s):: BNL-114711-2017-JA; PRBMDO; R&D Project: PM015; KC0207010; TRN: US1800341

Journal Information:: Physical Review B, Vol. 96, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Cited By (3)

Signatures of nodeless multiband superconductivity and particle-hole crossover in the vortex cores of ${FeTe}_{0.55} {Se}_{0.45}$ Berthod, Christophe Physical Review B, Vol. 98, Issue 14 https://doi.org/10.1103/physrevb.98.144519	journal	October 2018
Evidence for dispersing 1D Majorana channels in an iron-based superconductor Wang, Zhenyu; Rodriguez, Jorge Olivares; Jiao, Lin Science, Vol. 367, Issue 6473 https://doi.org/10.1126/science.aaw8419	journal	January 2020
Some Properties of Fe1 +ySexTe1 –x Single Crystals in the Superconducting and Normal States Vedeneev, S. I.; Golubkov, M. V.; Gorina, Yu. I. Journal of Experimental and Theoretical Physics, Vol. 127, Issue 4 https://doi.org/10.1134/s1063776118090200	journal	October 2018

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