High-pressure phase of CeRu2: A magnetic superconductor with two charge states of Ru ions
A. V. Tsvyashchenko, L. N. Fomicheva, A. A. Sorokin, G. K. Ryasny, B. A. Komissarova, L. G. Shpinkova, K. V. Klementiev, A. V. Kuznetsov, A. P. Menushenkov, V. N. Trofimov, A. E. Primenko, R. Cortes
DOI 10.1103/PhysRevB.65.174513 · Physical Review B
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Abstract
The intermetallic compounds LaRu2 and CeRu2, as well as several quasibinary systems Ce1−xLaxRu2, were synthesized at a pressure of 8 GPa. The x-ray diffraction data showed the pure cubic C15 structure for all samples. The x-ray absorption measurements gave the value 3.23 for the Ce valence. Time-differential perturbed angular correlation measurements with the 111In-doped samples have shown (i) 111In substituted for Ru; (ii) in LaRu2 a single value of the quadrupole frequency νQ=234 MHz for the daughter 111Cd nuclei was observed; (iii) in CeRu2 two distinct equally populated sites for 111Cd were revealed with νQ=218 and νQ=153 MHz. The low-temperature magnetic measurements showed that magnetic moments about 0.3μB per formula unit are inherent in all samples and indicated at a coexistence of superconductivity and magnetic ordering. In particular, the magnetic and superconducting correlations are developing, most probably, in the same system of ruthenium 4d electrons.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeRu2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.2 | Pressure not reported | unknown |
| LaRu2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.08 | Pressure not reported | unknown |
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