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Theory of Heavy Fermions and Mechanism of Heavy Fermion Superconductivity — Application to High Tc Oxide Superconductors
Abstract Such alloys as CeCu2Si2, UBe13, UPt3 and others are called to be heavy fermions, as the effective masses obtained from the specific heat measurement are about 40 ∼ 1000 times the bare electron mass. Below the coherent temperature Tcoh of the order of a few tenth of the Kondo temperature TK, the magnetic susceptibility behaves differently from the one of the localized moment which shows the Kondo effect, the Wilson ratios have the value near unity rather than two, and the electrical conductivity is proportional to the square of the temperature, T2, near T = 0. All these indicate the heavy fermions behave as if free electrons. Furthermore some of them, capable of being superconductive, show the P or probably D wave superconductivity, beside the S wave one. Recently found Y-Ba type copper oxide superconductors have the effective mass of 10 ∼ 30 times the bare electron mass, and it may be worthwhile to examine its mechanism and to estimate TC in the light of the heavy fermion theory to be explained hereafter.
Theory of Heavy Fermions and Mechanism of Heavy Fermion Superconductivity — Application to High Tc Oxide Superconductors
Abstract Such alloys as CeCu2Si2, UBe13, UPt3 and others are called to be heavy fermions, as the effective masses obtained from the specific heat measurement are about 40 ∼ 1000 times the bare electron mass. Below the coherent temperature Tcoh of the order of a few tenth of the Kondo temperature TK, the magnetic susceptibility behaves differently from the one of the localized moment which shows the Kondo effect, the Wilson ratios have the value near unity rather than two, and the electrical conductivity is proportional to the square of the temperature, T2, near T = 0. All these indicate the heavy fermions behave as if free electrons. Furthermore some of them, capable of being superconductive, show the P or probably D wave superconductivity, beside the S wave one. Recently found Y-Ba type copper oxide superconductors have the effective mass of 10 ∼ 30 times the bare electron mass, and it may be worthwhile to examine its mechanism and to estimate TC in the light of the heavy fermion theory to be explained hereafter.
Theory of Heavy Fermions and Mechanism of Heavy Fermion Superconductivity — Application to High Tc Oxide Superconductors
Soda, Toshio (Autor:in)
Recent Progress in Many-Body Theories ; 1 ; 55-68
01.01.1988
14 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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