Weak ferromagnetism in non-centrosymmetric BiPd 4K superconductor

TL;DR

This study synthesizes non-centrosymmetric BiPd single crystals, revealing their superconducting properties below 4K and exhibiting weak ferromagnetism near the transition temperature, with detailed structural, magnetic, and transport analyses.

Contribution

First comprehensive characterization of BiPd's superconducting and weak ferromagnetic properties in a non-centrosymmetric monoclinic structure.

Findings

BiPd is superconducting below 4K.

BiPd exhibits weak ferromagnetism near Tc.

The estimated Hc2(0) is around 7.0kOe.

Abstract

We report synthesis of non-centrosymmetric BiPd single crystal by self flux method. The BiPd single crystal is crystallized in monoclinic structure with the P21 space group. Detailed SEM (Scanning Electron Microscopy) results show that the crystals are formed in slab like morphology with homogenous distribution of Bi and Pd. The magnetic susceptibility measurement confirmed that the BiPd compound is superconducting below 4K. Further, BiPd exhibits weak ferromagnetism near the superconducting transition temperature in isothermal magnetization (MH) measurements. The temperature dependent electrical resistivity also confirmed that the BiPd single crystal is superconducting at Tc=4K. Magneto transport measurements showed that the estimated Hc2(0) value is around 7.0kOe. We also obtained a sharp peak in heat capacity Cp(T) measurements at below 4K due to superconducting ordering. The normalized specific-heat jump, DC/{\gamma}Tc, is 1.52, suggesting the BiPd to be an intermediate BCS coupled superconductor. The pressure dependent electrical resistivity shows the Tc decreases with increasing applied pressure and the obtained dTc/dP is -0.62K/Gpa.