Type-I superconductivity in the noncentrosymmetric superconductor BeAu

D. Singh; A. D. Hillier; R. P. Singh

doi:10.1103/PhysRevB.99.134509

← Back to search

Type-I superconductivity in the noncentrosymmetric superconductor BeAu

D. Singh, A. D. Hillier, R. P. Singh

DOI 10.1103/PhysRevB.99.134509 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

The noncentrosymmetric superconductor BeAu has been investigated using magnetization, resistivity, specific heat, and muon-spin relaxation/rotation. BeAu crystallizes in a cubic FeSi-type B20 structure with a superconducting transition temperature Tc=3.2±0.1K. The low-temperature specific heat data, Cel(T), indicates a weakly-coupled fully gapped BCS superconductivity with an isotropic energy gap 2Δ(0)/kBTc=3.76, close to the BCS value of 3.52. Interestingly, type-I superconductivity is inferred from the μSR measurements, in contrast to the earlier reports of type-II superconductivity in BeAu. The Ginzburg-Landau parameter is κGL=0.4<1/2. The frequency domain transverse-field μSR spectra, depicting the internal magnetic field probability distribution, P(B), also confirms the absence of the mixed state in BeAu. The thermodynamic critical field, Hc, is calculated to be around 259 Oe. The zero-field μSR results indicate that time-reversal symmetry is preserved and supports a spin-singlet pairing in the superconducting ground state.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BeAu Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.2	Pressure not reported	midpoint
BeAu Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.2	Pressure not reported	onset
BeAu Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.17	Pressure not reported	unknown
BeAu Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.2	Pressure not reported	unknown
CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Li2Pt3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeIrSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
LaNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown