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Title: Probing the superconducting gap symmetry of α - PdBi 2 : A penetration depth study

In this paper, we report measurements of the in-plane London penetration depth λ in single crystals of the α - PdBi 2 superconductor—the α-phase counterpart of the putative topological superconductor β - PdBi 2 , down to 0.35 K using a high-resolution tunnel-diode-based technique. Both λ and superfluid density ρ s exhibit an exponential behavior for T ≤ 0.35T c, with Δ(0) /k BT c ~ 2.0, ΔC/γT c ~ 2.0, and λ(0) ~ 140 nm, showing that α - PdBi 2 is a moderately coupling, fully gapped superconductor. Finally, the values of Δ(0) and ΔC/γT c are consistent with each other via strong-coupling corrections.
Authors:
 [1] ;  [2] ;  [1] ;  [2] ;  [3] ;  [1]
  1. Nanyang Technological Univ. (Singapore). Division of Physics and Applied Physics. School of Physical and Mathematical Sciences
  2. Tokyo Inst. of Technology (Japan). Lab. for Materials. Structures Lab.
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-22950
Journal ID: ISSN 2469-9950; TRN: US1703241
Grant/Contract Number:
AC52-06NA25396; RG13/12
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 13; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Nanyang Technological Univ. (Singapore); Tokyo Inst. of Technology (Japan); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Ministry of Education (MOE) (Singapore); Japan Science and Technology Agency (JST); Japan Society for the Promotion of Science (JSPS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconducting order parameter; superfluid density; topological materials; condensed matter & materials physics
OSTI Identifier:
1402630
Alternate Identifier(s):
OSTI ID: 1353500