2010/02/16 by Shinji Watanabe, Kazumasa Miyake · 8 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Fermi liquid theory #Fermion #Iron-based superconductors research #Magnetic field #Magnetization #Metamagnetism #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum critical point #Quantum mechanics #Quantum phase transition #Rare-earth and actinide compounds #Strongly correlated material #Superconductivity #Valence (chemistry) #cond-mat.str-el
paper · pdf · doi:10.1002/pssb.200983011
published in physica status solidi (b) 247(3), 490-494 (Wiley) · 6 pages, 4 figures
openalex publication_date 2010/02/16 · arxiv created 2011/01/12 · arxiv updated 2015/03/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract Influence of quantum critical point (QCP) of first‐order valence transition (FOVT) on Ce‐ and Yb‐based heavy fermions is discussed as a key origin of anomalies such as non‐Fermi liquid, metamagnetism, and unconventional superconductivity. Even in intermediate‐valence materials, the QCP of the FOVT is shown to be induced by applying the magnetic field, which creates a new characteristic energy distinct from the Kondo temperature. It is stressed that the key concept is closeness to the QCP of the FOVT by pointing out that the proximity of the QCP explains sharp contrast between X = Ag and X = Cd in YbXCu 4 , field‐induced valence crossover in X = Au, and field‐induced first‐order transition as well as non‐Fermi‐liquid critical behaviors in CeIrIn 5 . The valence fluctuations can be a key origin of unresolved phenomena in this family of materials.