Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-02-09
J. Phys.:Condens. Matter 23 (2011) 094217
Physics
Condensed Matter
Strongly Correlated Electrons
17 pages, 8 figures, invited paper in special issue on strongly correlated electron systems
Scientific paper
10.1088/0953-8984/23/9/094217
The roles of critical valence fluctuations of Ce and Yb are discussed as a key origin of several anomalies observed in Ce- and Yb-based heavy fermion systems. Recent development of the theory has revealed that a magnetic field is an efficient control parameter to induce the critical end point of the first-order valence transition. Metamagnetism and non-Fermi liquid behavior caused by this mechanism are discussed by comparing favorably with CeIrIn5, YbAgCu4, and YbIr2Zn20. The interplay of the magnetic order and valence fluctuations offers a key concept for understanding Ce- and Yb-based systems. It is shown that suppression of the magnetic order by enhanced valence fluctuations gives rise to the coincidence of the magnetic-transition point and valence-crossover point at absolute zero as a function of pressure or magnetic field. The interplay is shown to resolve the outstanding puzzle in CeRhIn5 in a unified way. The broader applicability of this newly clarified mechanism is discussed by surveying promising materials such as YbAuCu4, beta-YbAlB4, and YbRh2Si2.
Miyake Kazumasa
Watanabe Shinji
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