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Heavy Fermions and Coherent and Incoherent Valence Fluctuations in Cerium Systems
Abstract During the past few years, numerous highly correlated f-electron or heavy-fermion (HF) systems have been discovered.1−3 Much of the present interest in these unusual systems is now focused on appropriately placing their fascinating properties within the broad spectrum of magnetic behavior associated with magnetic moment formation and establishing the nature of the f-electron correlations in superconducting, antiferromagnetic and normal paramagnetic HF systems. Many of the unusual properties reported for HF systems and the evolution from mixed valent to HF behavior within the broad context of magnetic phenomena are intimately related to the strength of the f-electron hybridization with the spd conduction electrons. Systematic studies in which the strength of the hybridization is gradually changed are therefore of fundamental importance to the understanding of these systems. The degree of hybridization can be increased by hydrostatic pressure, although the range of variation is experimentally limited. The evolution of the HF state as the f-electron hybridization is varied over a wide range is more conveniently studied by alloying with other appropriate isomorphic systems. However, experimental efforts have been hampered by the limited solubility of many of the known HF intermetallic compounds.
Heavy Fermions and Coherent and Incoherent Valence Fluctuations in Cerium Systems
Abstract During the past few years, numerous highly correlated f-electron or heavy-fermion (HF) systems have been discovered.1−3 Much of the present interest in these unusual systems is now focused on appropriately placing their fascinating properties within the broad spectrum of magnetic behavior associated with magnetic moment formation and establishing the nature of the f-electron correlations in superconducting, antiferromagnetic and normal paramagnetic HF systems. Many of the unusual properties reported for HF systems and the evolution from mixed valent to HF behavior within the broad context of magnetic phenomena are intimately related to the strength of the f-electron hybridization with the spd conduction electrons. Systematic studies in which the strength of the hybridization is gradually changed are therefore of fundamental importance to the understanding of these systems. The degree of hybridization can be increased by hydrostatic pressure, although the range of variation is experimentally limited. The evolution of the HF state as the f-electron hybridization is varied over a wide range is more conveniently studied by alloying with other appropriate isomorphic systems. However, experimental efforts have been hampered by the limited solubility of many of the known HF intermetallic compounds.
Heavy Fermions and Coherent and Incoherent Valence Fluctuations in Cerium Systems
Lin, C. L. (author) / Crow, J. E. (author) / Mihalisin, T. (author) / Schlottmann, P. (author)
1987-01-01
10 pages
Article/Chapter (Book)
Electronic Resource
English
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