Conventional superconductivity in single-crystalline BiPt

TL;DR

This study characterizes the structural and superconducting properties of high-quality single-crystalline BiPt, revealing it as a conventional s-wave superconductor with anisotropic features and providing insights into its pairing mechanism.

Contribution

It offers a comprehensive experimental analysis of BiPt's superconductivity, establishing its nature and properties, and compares it to topologically nontrivial superconductors.

Findings

BiPt is a weak type-II superconductor with Tc of 1.2 K.

Exhibits anisotropic superconducting characteristics due to its hexagonal structure.

Maintains time-reversal symmetry with conventional s-wave pairing.

Abstract

Binary Bi-Pd/Pt systems have attracted a lot of interest because of their topologically non-trivial nature along with superconductivity. We report the structural and superconducting properties of high-quality single-crystalline BiPt using a comprehensive range of experimental techniques, including X-ray diffraction, electron microscopy, muon spin rotation/relaxation ({\mu}SR), magnetization, resistivity, and heat capacity. Our findings establish that BiPt is a weak type-II superconductor with a transition temperature (Tc) of 1.2 K which exhibits pronounced anisotropic superconducting characteristics attributed to its hexagonal crystal structure. Magnetization and electronic transport studies reveal that BiPt lies within the dirty limit, while {\mu}SR and heat capacity data indicate conventional s-wave superconductivity that maintains time-reversal symmetry. This work provides valuable insights into the pairing symmetry and superconducting mechanism of topologically trivial BiPt, a sound comparison system for other Bi-based topologically nontrivial superconductors.