Influence of multiband sign-changing superconductivity on vortex cores and vortex pinning in stoichiometric high- Tc CaKFe4As4

Fente, Anton; Meier, William R.; Kong, Tai; Kogan, Vladimir G.; Bud'ko, Sergey L.; Canfield, Paul C.; Guillamon, Isabel; Suderow, Hermann

doi:10.1103/PhysRevB.97.134501

Title: Influence of multiband sign-changing superconductivity on vortex cores and vortex pinning in stoichiometric high- $T_{c} {CaKFe}_{4} {As}_{4}$

Journal Article · Mon Apr 02 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.134501· OSTI ID:1433657

Fente, Anton ^[1]; Meier, William R. ^[2]; Kong, Tai ^[2]; Kogan, Vladimir G. ^[3]; Bud'ko, Sergey L. ^[2]; Canfield, Paul C. ^[2]; Guillamon, Isabel ^[1]; Suderow, Hermann ^[1]

Autonomous Univ. of Madrid (Spain). Lab. de Bajas Temperaturas y Altos Campos Magnéticos, Dept. de Física de la Materia Condensada, Inst. de Ciencia de Materiales Nicolas Cabrera and Condensed Matter Physics Center (IFIMAC), Unidad Asociada UAM/CSIC
Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics & Astronomy
Ames Lab., Ames, IA (United States)

We use a scanning tunneling microscope to study the superconducting density of states and vortex lattice of single crystals of CaKFe₄As₄. This material has a critical temperature of T_c = 35 K, one of the highest among stoichiometric iron based superconductors (FeBSCs), and is comparable to T_c found near optimal doping in other FeBSCs. We observe quasiparticle scattering from defects with a pattern related to interband scattering between zone centered hole sheets. We measure the tunneling conductance in vortex cores and find a peak due to Caroli–de Gennes–Matricon bound states. The peak is located above the Fermi level, showing that CaKFe₄As₄ is a clean superconductor with vortex core bound states close to the so-called extreme quantum limit. We identify locations where the superconducting order parameter is strongly suppressed due to pair breaking. Vortices are pinned at these locations, and the length scale of the suppression of the order parameter is of order of the vortex core size. Finally, as a consequence, the vortex lattice is disordered up to 8 T.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation; USDOE

Grant/Contract Number:: 679080; AC02-07CH11358; GBMF4411

OSTI ID:: 1433657

Alternate ID(s):: OSTI ID: 1430776

Report Number(s):: IS-J-9594; PRBMDO; TRN: US1802406

Journal Information:: Physical Review B, Vol. 97, 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: 33 works

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