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Title: Low superfluid density and possible multigap superconductivity in the BiS 2 -based layered superconductor Bi 4 O 4 S 3

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics

The magnetic penetration depth λ as a function of temperature in Bi 4 O 4 S 3 was studied by muon-spin-spectroscopy measurements. The superfluid density of Bi 4 O 4 S 3 is found to be very low. The dependence of λ - 2 on temperature possibly suggests the existence of two s -wave-type energy gaps with the zero-temperature values of 0.93 (3) and 0.09 (4) meV. The upturn in the temperature dependence of the upper critical field close to T c further supports multigap superconductivity in Bi 4 O 4 S 3 . The presence of two superconducting energy gaps is consistent with theoretical and other experimental studies. However, a single-gap s -wave model fit with a gap of 0.88 (2) meV cannot be ruled out completely. The value of λ ( T ) at T = 0 K is estimated to be λ ( 0 ) = 861 ( 17 ) nm, one of the largest of all known layered superconductors, reflecting a very low superfluid density.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
AC02-98CH10886
OSTI ID:
1385454
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 88, Issue 22; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

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