Correlated electron state in Ce(1-x)Yb(x)CoIn5 stabilized by cooperative valence fluctuations.
Phys Rev Lett
; 106(15): 156403, 2011 Apr 15.
Article
em En
| MEDLINE
| ID: mdl-21568584
ABSTRACT
X-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat measurements on Ce(1-x)Yb(x)CoIn5 (0≤x≤1) reveal that many of the characteristic features of the x=0 correlated electron state are stable for x≤0.775 and that phase separation occurs for x>0.775. The stability of the correlated electron state is apparently due to cooperative behavior of the Ce and Yb ions, involving their unstable valences. Low-temperature non-Fermi liquid behavior is observed and varies with x, even though there is no readily identifiable quantum critical point. The superconducting critical temperature T(c) decreases linearly with x towards 0 K as xâ1, in contrast with other HF superconductors where T(c) scales with T(coh).
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article