Superconductivity of filled skutterudites LaRu4As12 and PrRu4As12

Ichimin Shirotani; Takanori Uchiumi; Katsushi Ohno; Chihiro Sekine; Yasuhiro Nakazawa; Kazushi Kanoda; Sakae Todo; Takehiko Yagi

doi:10.1103/PhysRevB.56.7866

Superconductivity of filled skutterudites LaRu4As12 and PrRu4As12

Ichimin Shirotani, Takanori Uchiumi, Katsushi Ohno, Chihiro Sekine, Yasuhiro Nakazawa, Kazushi Kanoda, Sakae Todo, Takehiko Yagi

DOI 10.1103/PhysRevB.56.7866 · Physical Review B

T1

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Abstract

Ternary ruthenium arsenides with the skutterudite structure, LaRu4As12 and PrRu4As12 have been prepared at high temperatures and high pressures. Electrical and magnetic properties of both compounds have been studied at low temperatures. Superconductivity in LaRu4As12 and PrRu4As12 was found at around 10.3 and 2.4 K, respectively. The Tc of LaRu4As12 is the highest amongst skutterudite compounds. The specific heat of LaRu4As12 has been measured between 2 and 20 K. The specific-heat data can be fit to the expression C=γT+βT3, where γ=73mJ/molK2 and β=2.6 mJ/molK4, resulting in a Debye temperature (Θ) of 233 K. PrRu4As12 is the only known superconductor within the family of magnetic rare-earth filled skutterudites. The arsenic plays an important role for the enhancement of superconductivity in both arsenides. Properties of the superconductivity of LaRu4As12 and PrRu4As12 are discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaRu4As12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.3	Pressure not reported	onset
LaRu4As12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.3	Pressure not reported	onset
LaRu4As12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.1	Pressure not reported	midpoint
PrRu4As12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.4	Pressure not reported	onset
PrRu4As12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.4	Pressure not reported	onset
LaRu4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.8	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
LaRu4P12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown
LaOs4P12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.8	Pressure not reported	unknown
ZrRuAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11	Pressure not reported	unknown
ZrRuP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13	Pressure not reported	unknown
PrMo6S8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.55	Pressure not reported	unknown