Superconducting and normal-state properties of the high-entropy alloy Nb-Re-Hf-Zr-Ti investigated by muon spin relaxation and rotation

Abstract

Superconducting high entropy alloys (HEAs) are emerging as an exotic class of superconducting materials, providing a unique opportunity to understand the complex interplay of disorder and superconductivity. We report the synthesis and detail bulk and microscopic characterization of a Nb 60 Re 10 Zr 10 Hf 10 Ti 10 HEA alloy using transport, magnetization, specific heat, and muon spin rotation/relaxation (μSR) measurements. Bulk superconductivity with transition temperature T C = 5.7 K is confirmed by magnetization, resistivity, and heat capacity measurements. Zero-field μSR measurements confirm that the superconducting state preserves timereversal symmetry, and transverse-field measurements show that the superfluid density is well described by an isotropic s-wave model.

Superconducting properties of pseudobinary telluride Chevrel phase Mo4Re2Te8

“…low-lying phonons, is responsible for it [15,16]. The observed large superconducting gap value in CPs is also similar to the superconductivity mediated by soft phonons (low-lying phonons) with a strong electron-phonon coupling, as recently observed in IrGe [17], BaPd 2 As 2 [18] and SrPt 3 P [19]. Furthermore, the superconducting properties of CPs depend on the intercluster Mo-Mo distance [12,20].…”

Superconducting properties of new hexagonal and noncentrosymmetric cubic high entropy alloys

“…Due to the atomic size difference, these alloys produce more compositional disorder (high mixing entropy) than conventional alloys and are therefore referred to as HEAs [7,8]. Recently, exotic phenomena such as superconductivity and complex magnetism have been exhibited, further enhancing their application spectrum for fundamental and application purposes [9][10][11][12][13][14][15]. However, the superconducting mechanism in these multicomponent alloys is not yet fully understood due to the lack of studies on the two critical ingredients, the electronic band * Author to whom any correspondence should be addressed.…”