Thermoelectric power and transport properties of pure and Al-doped MgB2

Details Thermoelectric power and transport properties of pure and Al-doped MgB2 Thermoelectric power and transport properties of pure and Al-doped MgB2

2001-04-02

arxiv.org/abs/cond-mat/0104041v1

Phys. Rev. B 64, 052513 (2001)

Physics

Condensed Matter

Superconductivity

10 pages, 2 figures; submitted to Physical Review B (April 2, 2001)

Scientific paper

10.1103/PhysRevB.64.052513

We have measured the thermoelectric power, S, and resistivity, rho, of pure and Al-doped MgB2. S is positive and increases linearly with temperature above the superconducting transition temperature, Tc. Deviations from the linear dependence appear at higher temperature, T>T0 approx 160 K. Tc and T0 both decrease with Al doping whereas the slope of S(T) in the linear range increases with the Al content. The data are discussed in terms of doping induced changes of the Fermi surface and the density of states at the Fermi level.

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