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Sandalov, I. S.
Effects of a low-energy local mode on the eliashberg function / I. S. Sandalov, B. Johansson // Phys. Rev. B. - 1994. - Vol. 49, Is. 17. - P. 12105-12114, DOI 10.1103/PhysRevB.49.12105. - Cited References: 13 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
K3C60
HEAT
Аннотация: Anharmonic contributions to the Eliashberg function due to a low-energy local boson mode of finite width are considered for a harmonic metal. Excitation of the multiple-frequency modes leads to redistribution of spectral weight in the generalized Eliashberg function from the low- to the high-energy region, which reduces the electron-boson coupling. This is seen in the calculated temperature dependence of the interaction constants lambda(n) entering the Eliashberg equations. The rapid decrease with temperature of lambda(n)0 can be used to derive a simple analytical expression, which reproduces almost exactly the temperature dependence, lambda(n)0(T), calculated from the exact expression. Normal-state properties of alkaline-doped C60 are investigated within the two-peak model (omega0 approximately 50 K and omega1 approximately 900 K) for the possibility to extract information about the local modes themselves and their coupling to the conduction electrons. The electronic specific heat shows pecularities only in the case of an extremely strong coupling. Due to the low-energy peak the temperature dependence of the electrical resistivity deviates more and more from the linear law with increasing adiabaticity parameter A = (m/M)(epsilon(F)/Homega0BAR). This leads, however, to a negative-curvature dependence. The experimental curve for K3C60 has a positive curvature and can be fitted only in the case of a very strong coupling of electrons to the high-energy mode. The thermal electronic conductivity displays a minimum at T approximately Homega0BAR/k(B). The curvature as a function of temperature is determined by the magnitude of A.

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Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН
Department of Physics, Uppsala University, Box 530, S-75121 Uppsala, Sweden
Kirensky Institute of Physics, Russian Academy of Science, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Johansson, B.; Сандалов, Игорь Семёнович
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