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High Pressure Investigations on the Heavy Fermion Material UPt3 at 300K
Abstract Mixed valent (MV or IV) and heavy Fermion (HF) behaviour exhibited by some Ce, Eu,Yb and U intermetallics are two aspects of the same problem with fatom spacing dependence of the f band width (real or virtual) as the control parameter1. The ground state of HF systems exhibits non-conventional superconductivity (UPt3 and Ce Cu2Si2, antiferromagnetic ordering (NpBe13)or the absence of both (CeAl3) concornmitant with high γ and large magnetic atom seperation which should normally allow localized spins. The high γ value implies a large density of states at the Fermi surface. Three types of models involving f electrons have been invoked which can result in high γ the two band models with an s−d conduction band and a narrow f band where the Fermi level is pinned to the f band, the Kondo lattice model where the conduction electrons are scattered by localized f electron spins and the Fermi liquid models with He3 as the prototype2. In the latter two models, at low temperatures narrow virtual f-bands develop at the fermi level and represent the HF systems more closely3.
High Pressure Investigations on the Heavy Fermion Material UPt3 at 300K
Abstract Mixed valent (MV or IV) and heavy Fermion (HF) behaviour exhibited by some Ce, Eu,Yb and U intermetallics are two aspects of the same problem with fatom spacing dependence of the f band width (real or virtual) as the control parameter1. The ground state of HF systems exhibits non-conventional superconductivity (UPt3 and Ce Cu2Si2, antiferromagnetic ordering (NpBe13)or the absence of both (CeAl3) concornmitant with high γ and large magnetic atom seperation which should normally allow localized spins. The high γ value implies a large density of states at the Fermi surface. Three types of models involving f electrons have been invoked which can result in high γ the two band models with an s−d conduction band and a narrow f band where the Fermi level is pinned to the f band, the Kondo lattice model where the conduction electrons are scattered by localized f electron spins and the Fermi liquid models with He3 as the prototype2. In the latter two models, at low temperatures narrow virtual f-bands develop at the fermi level and represent the HF systems more closely3.
High Pressure Investigations on the Heavy Fermion Material UPt3 at 300K
Vijaykumar, V. (author) / Godwal, B. K. (author) / Sikka, S. K. (author) / Chidambaram, R. (author)
1987-01-01
4 pages
Article/Chapter (Book)
Electronic Resource
English
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