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

Journal Article · · Physical Review B
 [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)

Here, the temperature dependence of the in-plane magnetic penetration depth (λab) in an extensively characterized sample of superconducting CaKFe4As4(Tc≃35K) was investigated using muon-spin rotation (μSR). A comparison of λ–2ab(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 Δ0=2.4(2)meV. Our data suggest that in CaKFe4As4 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.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
GBMF4411; 3.2166.2017/4.6; AC02-07CH11358
OSTI ID:
1434314
Alternate ID(s):
OSTI ID: 1432404
Report Number(s):
IS-J-9639; PRBMDO; TRN: US1802383
Journal Information:
Physical Review B, Vol. 97, Issue 14; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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