Title :
Properties of the new high Tc materials: an analysis based on fermiology
Author :
Kresin, V.Z. ; Deutscher, G. ; Wolf, S.A.
Author_Institution :
Lawrence Berkeley Lab., California Univ., CA, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
A small value of the Fermi energy, Ef, in the new high Tc oxides and its consequences are the subject of this study. It is shown that the small value of E f allows separation of the electronic contribution to the heat capacity in the high-temperature region Efk B>T>θD to determine the value of the electron-phonon coupling constant λ. The linear temperature dependence of the normal resistance is mainly due to a large anisotropy of the system. A small value of Ef allows the lattice contribution to the thermal conductivity to play a dominant role. A strong electron-phonon coupling is manifested in the increase of the thermal conductivity in the region T<Tc , and the appearance of such coupling is also connected with a small value of Ef
Keywords :
Fermi level; electron-phonon interactions; high-temperature superconductors; specific heat of solids; thermal conductivity of solids; Fermi energy; electron-phonon coupling constant; electronic contribution; fermiology; heat capacity; high Tc materials; high temperature superconductor; lattice contribution; linear temperature dependence; normal resistance; oxides; thermal conductivity; Anisotropic magnetoresistance; Astronomy; Fluctuations; Helium; Laboratories; Physics; Shape; Superconducting materials; Superconductivity; Thermodynamics;
Journal_Title :
Magnetics, IEEE Transactions on
