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

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

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...

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Bibliographic Details
Main Authors: Mitra, Sreemanta, Okawa, K., Kunniniyil Sudheesh, S., Sasagawa, T., Zhu, Jian-Xin, Chia, Elbert Ee Min
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2017
Subjects:
Strong-coupling corrections
Superconductor
Online Access:https://hdl.handle.net/10356/83574
http://hdl.handle.net/10220/43553
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Institution: Nanyang Technological University
Language: English
Description
Summary: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. The values of Δ(0) and ΔC/γTc are consistent with each other via strong-coupling corrections.

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