From heavy fermion to mixed valence, a study of Ce(Pb1−xSnx)3

1987 ◽  
Vol 61 (8) ◽  
pp. 4376-4378 ◽  
Author(s):  
C. L. Lin ◽  
J. E. Crow ◽  
P. Schlottmann ◽  
T. Mihalisin
Keyword(s):  
Heavy Fermion ◽  
Mixed Valence

Systematics of mixed valence and heavy fermion behaviors in YbCu5 and related systems

2000 ◽  
Vol 281-282 ◽  
pp. 141-143 ◽  
Author(s):  
Kazuyoshi Yoshimura ◽  
Naohito Tsujii ◽  
Kouichi Sorada ◽  
Takashi Kawabata ◽  
Hiroyuki Mitamura ◽  
...  
Keyword(s):  
Heavy Fermion ◽  
Mixed Valence

scholarly journals Avoided valence transition in a plutonium superconductor

2015 ◽  
Vol 112 (11) ◽  
pp. 3285-3289 ◽  
Author(s):  
B. J. Ramshaw ◽  
Arkady Shekhter ◽  
Ross D. McDonald ◽  
Jon B. Betts ◽  
J. N. Mitchell ◽  
...  
Keyword(s):  
Heavy Fermion ◽  
Cuprate Superconductors ◽  
Critical Role ◽  
Mixed Valence ◽  
Magnetic Fluctuations ◽  
Elastic Symmetry ◽  
Valence Transition ◽  
Valence Fluctuations ◽  
Wide Range ◽  
Valence Electrons

The d and f electrons in correlated metals are often neither fully localized around their host nuclei nor fully itinerant. This localized/itinerant duality underlies the correlated electronic states of the high-Tc cuprate superconductors and the heavy-fermion intermetallics and is nowhere more apparent than in the 5f valence electrons of plutonium. Here, we report the full set of symmetry-resolved elastic moduli of PuCoGa5—the highest Tc superconductor of the heavy fermions (Tc = 18.5 K)—and find that the bulk modulus softens anomalously over a wide range in temperature above Tc. The elastic symmetry channel in which this softening occurs is characteristic of a valence instability—therefore, we identify the elastic softening with fluctuations of the plutonium 5f mixed-valence state. These valence fluctuations disappear when the superconducting gap opens at Tc, suggesting that electrons near the Fermi surface play an essential role in the mixed-valence physics of this system and that PuCoGa5 avoids a valence transition by entering the superconducting state. The lack of magnetism in PuCoGa5 has made it difficult to reconcile with most other heavy-fermion superconductors, where superconductivity is generally believed to be mediated by magnetic fluctuations. Our observations suggest that valence fluctuations play a critical role in the unusually high Tc of PuCoGa5.

Model of interband pairing in mixed valence and heavy fermion systems

1987 ◽  
Vol 67 (1) ◽  
pp. 63-68 ◽  
Author(s):  
O. V. Dolgov ◽  
E. P. Fetisov ◽  
D. I. Khomski� ◽  
K. Svozil
Keyword(s):  
Heavy Fermion ◽  
Mixed Valence ◽  
Fermion Systems ◽  
Heavy Fermion Systems ◽  
Interband Pairing

scholarly journals Mixed-valence-driven heavy-fermion behavior and superconductivity in KNi2Se2

2012 ◽  
Vol 86 (5) ◽  
Author(s):  
James R. Neilson ◽  
Anna Llobet ◽  
Andreas V. Stier ◽  
Liang Wu ◽  
Jiajia Wen ◽  
...  
Keyword(s):  
Heavy Fermion ◽  
Mixed Valence ◽  
Heavy Fermion Behavior
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