Superconductivity and crystalline electric field effects in the filled skutterudite PrRu4As12
T. A. Sayles, R. E. Baumbach, W. M. Yuhasz, M. B. Maple, Ł. Bochenek, R. Wawryk, T. Cichorek, A. Pietraszko, Z. Henkie, P.-C. Ho
DOI 10.1103/PhysRevB.82.104513 · Physical Review B
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Abstract
Magnetization, electrical-resistivity, specific-heat, and thermopower measurements were performed on single crystals of the filled skutterudite compound PrRu4As12. These measurements reveal a superconducting transition near 2.5 K that is quantified by: (1) magnetic susceptibility data which display an onset to a Meissner state at Tc≈2.5 K and complete diamagnetic shielding as T→2.0 K, (2) electrical-resistivity data which show a transition to a zero-resistance state at Tc≈2.5 K, and (3) specific-heat and thermopower data which display “jumps” at Tc≈2.5 K. Furthermore, the electronic contribution to the specific heat follows the BCS prediction for a superconductor. For temperatures above Tc, magnetization measurements indicate local moment behavior where μeff=3.52 μB/Pr3+ ion. Analysis of the data for T>Tc, using a crystalline electric field model, suggests that PrRu4As12 has a Γ1 ground state with a Γ4 first excited state at TΓ4≈95 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PrRu4As12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | onset |
| PrRu4As12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | zero_resistance |
| PrRu4As12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.44 | Pressure not reported | midpoint |
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