Open AccessThe thermal/electronic transport properties of new superconductor MgB2 and MgCNi3
Author(s) -
Wu Bai-Mei,
Bo Li,
Dongsheng Yang,
Zheng Wei-Hua,
Shiyan Li,
Lei Cao,
Xianhui Chen
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.3150
Subject(s) - superconductivity , thermal conductivity , condensed matter physics , cuprate , materials science , impurity , phonon , electron , physics , quantum mechanics , composite material
The temperature dependence of thermal conductivity and electronic conductivity in superconductor MgB2, MgCNi3 and Bi2Sr2Ca0.9Ce0.1Cu2O8+y are presented. The thermal conductivity of Bi2Sr2Ca0.9Ce 0.1Cu2O8+y shows a peak under Tc observ ed in cuprates, but those of MgB 2 and MgCNi3 decrease monotonously. We calculate the elec tron thermal condu ctivity and the phonon thermal conductivity by Wiedemann-Franz law. The electron s contribute a large fraction to the thermal conductivity in normal state of MgB 2 and MgCNi3 because of the non-localigation of mutual eff ect of electrons. The analysis on electronic thermal conductivity indicates that the scattering by impurities prevails in electronic thermal resistance of both samples.