2002/02/26 by J. S. Ahn, E. S. Choi, W. Kang +5
Materials Science · Physics and Astronomy · #Condensed matter physics #Doping #Materials science #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Seebeck coefficient #Sigma #Superconductivity in MgB2 and Alloys #Thermal Expansion and Ionic Conductivity #Thermodynamics #Thermoelectric effect #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.65.214534
4 pages, 4 figures
arxiv created 2002/02/26 · openalex publication_date 2002/06/14 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigated thermoelectric power S(T) of MgB_2\ensuremath-xBex (x=0, 0.2, 0.3, 0.4, and 0.6). S(T) decreases systematically with x, suggesting that the hole density increases. Our band calculation shows that the increase occurs in the \ensuremathσ band. With the hole doping, Tc decreases. Implication of this phenomenon is discussed within the BCS framework. While the Mott formula explains only the linear part of S(T) at low temperature, incorporation of electron-phonon interaction enables us to explain S(T) over wide temperature range including the anomalous behavior at high temperature.