Low-temperature heat-capacity study of superconducting ternary silicides and germanides with the Sc5Co4Si10-type structure

L. S. Hausermann-Berg; R. N. Shelton

doi:10.1103/PhysRevB.35.6659

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Low-temperature heat-capacity study of superconducting ternary silicides and germanides with the Sc5Co4Si10-type structure

L. S. Hausermann-Berg, R. N. Shelton

DOI 10.1103/PhysRevB.35.6659 · Physical Review B

T1

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Abstract

The results of low-temperature specific-heat experiments on eleven superconducting compounds belonging to the ternary system R5T4X10 (R=Sc, Y, and Lu; T=Co, Rh, Ir, and Os; X=Si and Ge) are presented. Analysis of the data yields relatively high Debye temperatures for the silicides (300–600 K), as well as large values for ΔC/γTc (2.8–4.9) and the electron-phonon interaction λ (0.60–0.75) for the high-Tc compounds Sc5Rh4Si10, Sc5Ir4Si10, and Y5Os4Ge10, indicating that these are strong-coupled superconductors. The analysis also indicates that a large contribution of the anharmonic term to the total specific heat in the normal state is present in the low-Tc compounds. It is apparent that the phonon spectra of these Sc5Co4Si10-type materials are quite complex.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sc5Co4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.89	Pressure unresolved	unknown
Sc5Rh4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.43	Pressure unresolved	unknown
Sc5Ir4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.57	Pressure unresolved	unknown
Y5Rh4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.29	Pressure unresolved	unknown
Lu5Rh4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.45	Pressure unresolved	unknown
Lu5Ir4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.77	Pressure unresolved	unknown
Y5Rh4Ge10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.25	Pressure unresolved	unknown
Y5Ir4Ge10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.75	Pressure unresolved	unknown
Y5Os4Ge10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.1	Pressure unresolved	unknown
Lu5Rh4Ge10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.74	Pressure unresolved	unknown
Lu5Ir4Ge10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.54	Pressure unresolved	unknown