Herein, we report the synthesis and detailed superconducting properties of a new high entropy alloy superconductor with nominal composition Nb20Re20Zr20Hf20Ti20 using powder X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), magnetization, transport, and thermodynamic measurements. The room temperature powder XRD confirms that the alloy is arranged on a simple body centered cubic crystal lattice with lattice parameter a = 3.38 (1) A˚. EDX measurement yields an average composition of Nb21Re16Zr20Hf23Ti20 (in atomic %). Transport, magnetic and heat capacity measurements reveal that the material is a type-II superconductor with the bulk superconducting transition at Tc = 5.3 K, lower critical field Hc1(0) = 33 mT and upper critical field Hc2(0) = 8.88 T. Low temperature specific heat measurement indicates that the sample is a moderately coupled superconductor, and the electronic specific heat data fits well with the single-gap BCS model.
@article{arxiv.1804.10092,
title = {Superconductivity in equimolar Nb-Re-Hf-Zr-Ti high entropy alloy},
author = {Sourav Marik and Maneesha Varghese and K. P. Sajilesh and Deepak Singh and R. P. Singh},
journal= {arXiv preprint arXiv:1804.10092},
year = {2018}
}