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Heavy Fermion Properties and their Relation to Electronic Band Theory
Abstract Materials of the “heavy fermion” (HF) class of metals are characterized by extremely large values at low temperature of the linear specific heat coefficient γ(T) = C/T and their magnetic susceptibility χ(T). These highly enhanced thermodynamic properties are interpreted as due to fermionic quasiparticles bearing a very large effective mass m*. Neither γ nor χ remain constant as the temperature is raised, rather they display unusual temperature dependences before rapidly decreasing to normal values at high temperature. In addition the resistivity, which is large at room temperature, does not begin to decrease monotonically except at low temperatures of the order of 2–20 K. The crossover crudely defines a “coherence temperature” T 0, below which the excitations begin to look like fermionic quasiparticles. For T ~ T 0 more complex behavior occurs, indicative of strong many-body interactions which destroy the quasiparticle character of the excitations.
Heavy Fermion Properties and their Relation to Electronic Band Theory
Abstract Materials of the “heavy fermion” (HF) class of metals are characterized by extremely large values at low temperature of the linear specific heat coefficient γ(T) = C/T and their magnetic susceptibility χ(T). These highly enhanced thermodynamic properties are interpreted as due to fermionic quasiparticles bearing a very large effective mass m*. Neither γ nor χ remain constant as the temperature is raised, rather they display unusual temperature dependences before rapidly decreasing to normal values at high temperature. In addition the resistivity, which is large at room temperature, does not begin to decrease monotonically except at low temperatures of the order of 2–20 K. The crossover crudely defines a “coherence temperature” T 0, below which the excitations begin to look like fermionic quasiparticles. For T ~ T 0 more complex behavior occurs, indicative of strong many-body interactions which destroy the quasiparticle character of the excitations.
Heavy Fermion Properties and their Relation to Electronic Band Theory
Pickett, Warren E. (Autor:in)
Novel Superconductivity ; 233-242
01.01.1987
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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