Superconducting-transition temperatures of rare-earth rhodium boride compounds, R Rh 4 B 4 </…
1986; American Physical Society; Volume: 34; Issue: 3 Linguagem: Inglês
10.1103/physrevb.34.1496
ISSN1095-3795
Autores Tópico(s)Iron-based superconductors research
ResumoIt is shown that the superconducting-transition temperatures for all R${\mathrm{Rh}}_{4}$${\mathrm{B}}_{4}$ compounds, where R is a rare-earth (RE) element, can be combined and analyzed in a systematic way. The analysis utilizes an Abrikosov-Gorkov--type expression for pair breaking, with modifications for crystalline electric fields and changes of ${T}_{c}$ due to nonmagnetic effects, to describe ${T}_{c}$ values in concentrated systems, dilute alloys, and pseudoternary mixtures. As a result, it is seen that the exchange coupling parameter, N(0)${\mathrm{scrJ}}^{2}$, is larger for light RE than for heavy RE, with the increase being very large near the beginning of the rare-earth series. In view of a very similar effect in the R${\mathrm{Al}}_{2}$ system, it is suggested such a variation is common to RE systems.
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