Two-gap superconductivity in the noncentrosymmetric La3Se4 compound

F. Košuth; N. Potomová; Z. Pribulová; J. Kačmarčík; M. Naskar; D. S. Inosov; S. Ash; A. K. Ganguli; J. Šoltýs; V. Cambel; P. Szabó; P. Samuely

doi:10.1103/PhysRevB.110.174518

Two-gap superconductivity in the noncentrosymmetric La3Se4 compound

F. Košuth, N. Potomová, Z. Pribulová, J. Kačmarčík, M. Naskar, D. S. Inosov, S. Ash, A. K. Ganguli, J. Šoltýs, V. Cambel, P. Szabó, P. Samuely

DOI 10.1103/PhysRevB.110.174518 · Physical Review B

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Abstract

Point-contact Andreev reflection spectroscopy at low temperatures and high magnetic fields has been performed on a noncentrosymmetric La3Se4 superconductor with a critical temperature Tc=8 K. Two superconducting energy gaps Δ1 and Δ2, with 2Δ1/kBTc∼5.8 and 2Δ2/kBTc∼2.3, are directly observed in some of the spectra. The temperature and magnetic field effects help to resolve a two-gap structure even on the most frequent spectra where at low temperatures only a single gap is apparent, reflected in a pair of maxima around the zero bias. Two-gap superconductivity consistently with the point contact Andreev reflection spectroscopy is also supported by the heat capacity and the Hall probe magnetization measurements.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La3Se4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown
La3Se4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.1	Pressure not reported	onset
CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2C3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Y2C3 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