Influence of multiband sign-changing superconductivity on vortex cores and vortex pinning in stoichiometric high-
Abstract
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 Tc = 35 K, one of the highest among stoichiometric iron based superconductors (FeBSCs), and is comparable to Tc 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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation; USDOE
- OSTI Identifier:
- 1433657
- Alternate Identifier(s):
- OSTI ID: 1430776
- Report Number(s):
- IS-J-9594
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1802406
- Grant/Contract Number:
- 679080; AC02-07CH11358; GBMF4411
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 13; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Fente, Anton, Meier, William R., Kong, Tai, Kogan, Vladimir G., Bud'ko, Sergey L., Canfield, Paul C., Guillamon, Isabel, and Suderow, Hermann. Influence of multiband sign-changing superconductivity on vortex cores and vortex pinning in stoichiometric high- Tc CaKFe4As4. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.97.134501.
Fente, Anton, Meier, William R., Kong, Tai, Kogan, Vladimir G., Bud'ko, Sergey L., Canfield, Paul C., Guillamon, Isabel, & Suderow, Hermann. Influence of multiband sign-changing superconductivity on vortex cores and vortex pinning in stoichiometric high- Tc CaKFe4As4. United States. https://doi.org/10.1103/PhysRevB.97.134501
Fente, Anton, Meier, William R., Kong, Tai, Kogan, Vladimir G., Bud'ko, Sergey L., Canfield, Paul C., Guillamon, Isabel, and Suderow, Hermann. Mon .
"Influence of multiband sign-changing superconductivity on vortex cores and vortex pinning in stoichiometric high- Tc CaKFe4As4". United States. https://doi.org/10.1103/PhysRevB.97.134501. https://www.osti.gov/servlets/purl/1433657.
@article{osti_1433657,
title = {Influence of multiband sign-changing superconductivity on vortex cores and vortex pinning in stoichiometric high- Tc CaKFe4As4},
author = {Fente, Anton and Meier, William R. and Kong, Tai and Kogan, Vladimir G. and Bud'ko, Sergey L. and Canfield, Paul C. and Guillamon, Isabel and Suderow, Hermann},
abstractNote = {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 Tc = 35 K, one of the highest among stoichiometric iron based superconductors (FeBSCs), and is comparable to Tc 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.},
doi = {10.1103/PhysRevB.97.134501},
journal = {Physical Review B},
number = 13,
volume = 97,
place = {United States},
year = {Mon Apr 02 00:00:00 EDT 2018},
month = {Mon Apr 02 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Figures / Tables found in this record: