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Title: Influence of multiband sign-changing superconductivity on vortex cores and vortex pinning in stoichiometric high- T c   CaKFe 4 As 4

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:
 [1];  [2];  [2];  [3];  [2];  [2];  [1];  [1]
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  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
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics & Astronomy
  3. 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.
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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
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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.
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@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}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevB.97.134501
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Cited by: 33 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) The Fourier transform of scattering patterns at defects at different bias voltages in zero magnetic field and 0.8 K. White scale bar is of 0.1 π/a where a is the in-plane lattice parameter (a = 3.861 Å at about 6 K, see [8]). (b) The magnitude ofmore » the Fourier transform averaged over the path marked by white dashed lines in (a) as a function of the bias voltage. (c) The reciprocal space vector obtained from our data (black lines with arrows) as a function of the energy. The length of the black lines is the radius of the interference pattern marked in (a) by a white dashed circle. Lateral error bars provide the width of the pattern. We also plot a simplified schematics of the band dispersion obtained from Angular Resolved Photoemission (ARPES). In the main panel, ARPES data are shown as blue lines, including β hole and γ electron sheets. In the inset we show the Fermi surface, with hole sheets as blue circles and electron sheets as red circles. For clarity, we do not show the α band, which is a small hole band at the center of the Brillouin zone. Our data (black lines with arrows) follow the band dispersion schematically shown by dashed blue lines in the main panel. In the inset we show the corresponding vector as a black line with arrows. (d) The real space topographic STM map (color scale bar giving height differences at the right). White circles highlight defects observed at the surface. High resolution images of defects are provided and discussed in the Appendix. (e) and (f) Tunneling conductance maps roughly at the gap edge (e) and at zero bias (f) using the same conductance scale (color bar giving conductance differences at the right). White circles are at the positions where we find defects in (d). White scale bars in (d,e,f) are of 20 nm.« less
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    Works referencing / citing this record:

    Gate-tunable anomalous transverse voltage at the superconducting LaAlO 3 /SrTiO 3 interface
    journal, August 2019

    • Yan, Yuedong; Wei, Laiming; Guo, Linhai
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    Effect of pressure on the self-hole-doped superconductor RbGd 2 Fe 4 As 4 O 2
    journal, December 2018

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    Enhancement of critical current density in CaKFe 4 As 4 single crystals through 3 MeV proton irradiation
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    • Haberkorn, N.; Xu, M.; Meier, W. R.
    • Superconductor Science and Technology, Vol. 33, Issue 2
    • DOI: 10.1088/1361-6668/ab5f4b

    Flux pinning and the vortex phase diagram in optimized CaKFe 4 As 4 single crystals fabricated by a one-step method
    journal, February 2020

    • Wang, Chunlei; He, Tian; Han, Qianqian
    • Superconductor Science and Technology, Vol. 33, Issue 4
    • DOI: 10.1088/1361-6668/ab75aa
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