Open AccessSTUDY ON THE THERMOPOWER AND RESISTIVITY OF A NEW SUPERCONDUCTOR MgB2
Author(s) -
Yang Hongshun,
Min Yu,
Shiyan Li,
Pengcheng Li,
Chai Yi Sheng,
Liang Zhang,
Xianhui Chen,
Lei Cao
Publication year - 2001
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.50.1197
Subject(s) - seebeck coefficient , condensed matter physics , phonon drag , electrical resistivity and conductivity , superconductivity , materials science , atmospheric temperature range , fermi surface , charge carrier , physics , thermodynamics , quantum mechanics
The temperature-dependent thermopower and resistivity of MgB2 were measured.In the range of 100—300K, the thermopower presents positive nearly linear temperature dependence,indicating that the charge carrier is hole and it is consistent with the energy band pattern.In contrast,the resistivity follows T2 relationship in the same temperature range.Below 100K,thermopower and resistivity change their temperature dependence.The thermopower presents a hump between the superconducting transition temperature Tc (zero resistance,36.6K) and 100K.It has the characteristic of the phonon drag,indicating the strong electron-phonon interaction.Some important parameters are estimated according to experimental results,such as Fermi energy EF and energy band width.