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

Abstract

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:
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)
OSTI Identifier:
1402630
Alternate Identifier(s):
OSTI ID: 1353500
Report Number(s):
LA-UR-17-22950
Journal ID: ISSN 2469-9950; TRN: US1703241
Grant/Contract Number:  
AC52-06NA25396; RG13/12
Resource Type:
Journal Article: 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)
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

Citation Formats

Mitra, S., Okawa, K., Kunniniyil Sudheesh, S., Sasagawa, T., Zhu, Jian-Xin, and Chia, Elbert E. M.. Probing the superconducting gap symmetry of α-PdBi2: A penetration depth study. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.134519.
Mitra, S., Okawa, K., Kunniniyil Sudheesh, S., Sasagawa, T., Zhu, Jian-Xin, & Chia, Elbert E. M.. Probing the superconducting gap symmetry of α-PdBi2: A penetration depth study. United States. doi:10.1103/PhysRevB.95.134519.
Mitra, S., Okawa, K., Kunniniyil Sudheesh, S., Sasagawa, T., Zhu, Jian-Xin, and Chia, Elbert E. M.. Thu . "Probing the superconducting gap symmetry of α-PdBi2: A penetration depth study". United States. doi:10.1103/PhysRevB.95.134519. https://www.osti.gov/servlets/purl/1402630.
@article{osti_1402630,
title = {Probing the superconducting gap symmetry of α-PdBi2: A penetration depth study},
author = {Mitra, S. and Okawa, K. and Kunniniyil Sudheesh, S. and Sasagawa, T. and Zhu, Jian-Xin and Chia, Elbert E. M.},
abstractNote = {In this paper, we report measurements of the in-plane London penetration depth λ in single crystals of the α-PdBi2 superconductor—the α-phase counterpart of the putative topological superconductor β-PdBi2, down to 0.35 K using a high-resolution tunnel-diode-based technique. Both λ and superfluid density ρs exhibit an exponential behavior for T ≤ 0.35Tc, with Δ(0) /kBTc ~ 2.0, ΔC/γTc ~ 2.0, and λ(0) ~ 140 nm, showing that α-PdBi2 is a moderately coupling, fully gapped superconductor. Finally, the values of Δ(0) and ΔC/γTc are consistent with each other via strong-coupling corrections.},
doi = {10.1103/PhysRevB.95.134519},
journal = {Physical Review B},
number = 13,
volume = 95,
place = {United States},
year = {Thu Apr 27 00:00:00 EDT 2017},
month = {Thu Apr 27 00:00:00 EDT 2017}
}

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