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Title: In-plane magnetic penetration depth of superconducting CaKFe 4 As 4

Here, the temperature dependence of the in-plane magnetic penetration depth (λ ab) in an extensively characterized sample of superconducting CaKFe 4As 4(T c≃35K) was investigated using muon-spin rotation (μSR). A comparison of λ –2 ab(T) measured by μSR with the one inferred from angle-resolved photoemission spectroscopy (ARPES) data confirms the presence of multiple gaps at the Fermi level. An agreement between μSR and ARPES requires the presence of additional bands, which are not resolved by ARPES experiments. These bands are characterized by small superconducting gaps with an average zero-temperature value of Δ 0=2.4(2)meV. Our data suggest that in CaKFe 4As 4 the s ± order parameter symmetry acquires a more sophisticated form by allowing a sign change not only between electron and hole pockets, but also within pockets of similar type.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [1] ;  [2] ;  [2] ;  [1]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. Ruhr-Univ. Bochum, Bochum (Germany); Kazan Federal Univ., Kazan (Russian Federation)
Publication Date:
Report Number(s):
IS-J-9639
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
GBMF4411; 3.2166.2017/4.6; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 14; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1434314
Alternate Identifier(s):
OSTI ID: 1432404