Filled skutterudite superconductor CaOs4P12 prepared by high-pressure synthesis

Yukihiro Kawamura; Shingo Deminami; Leonid Salamakha; Andrey Sidorenko; Patrick Heinrich; Herwig Michor; Ernst Bauer; Chihiro Sekine

doi:10.1103/PhysRevB.98.024513

Filled skutterudite superconductor CaOs4P12 prepared by high-pressure synthesis

Yukihiro Kawamura, Shingo Deminami, Leonid Salamakha, Andrey Sidorenko, Patrick Heinrich, Herwig Michor, Ernst Bauer, Chihiro Sekine

DOI 10.1103/PhysRevB.98.024513 · Physical Review B

T1

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Abstract

In this paper, we report the transport, thermodynamic, and superconducting properties of a new filled skutterudite CaOs4P12 synthesized under high pressure and high temperature. The electrical resistivity of 3.4–4.8mΩcm, carrier concentration of 3.8–6.1×1020cm−3, and positive Hall coefficient suggest that CaOs4P12 is a semimetal with hole carriers. An anomaly due to low-energy optical modes corresponding to an Einstein temperature of 150 K was observed in the specific heat. Resistivity, dc magnetic susceptibility, and specific heat measurements indicate bulk superconductivity below 2.5 K. The specific heat anomaly at Tc,ΔC/γTc≈1.4, is in agreement with the Bardeen-Cooper-Schrieffer (BCS) value of 1.43. The electron-phonon coupling constant λep is estimated to be 0.47. CaOs4P12 is classified as a BCS-type, weakly coupled type-II superconductor with an upper critical field of Hc2≈22 kOe and Ginzburg-Landau coherence length of ξ≈12 nm.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CaOs4P12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.5	Pressure not reported	midpoint
CaOs4P12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.5	Pressure not reported	midpoint
CaOs4P12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.5	Pressure not reported	midpoint
PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.85	Pressure not reported	unknown
LaFe4P12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.1	Pressure not reported	unknown
YFe4P12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.6	Pressure not reported	unknown
La0.8Rh4P12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14.9	Pressure not reported	unknown
SrOs4As12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.8	Pressure not reported	unknown
BaOs4P12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.8	Pressure not reported	unknown