Electron transport properties of MgB2 in the normal state

Abstract

We have measured the resistivity and the Seebeck coefficient of a MgB2 sintered sample. The temperature dependence of resistivity is fitted well by a generalized Bloch-Gruneisen equation with a Debye temperature of 1050 K. The Seebeck coefficient is given by the sum of a diffusive and a phonon drag term and the behavior in the temperature region follows a relationship $AT+B{T}^3$ where the two terms are proportional to the electron and to the phonon specific heat, respectively. The phonon drag term, here emphasized for the first time, is rather large, indicating a strong electron-phonon interaction. The diffusive term is positive and increases with Al doping. The comparison of the experimental values with calculations including precise electronic structure suggests that $\sigma$ bands give the main contribution to the Seebeck effect.

9 pages, 3 figures

Cited by in corpus (9)

• Coexistence of four-band nodal rings and triply-degenerate nodal points in centrosymmetric metal diborides
• Two-band effects in transport properties of MgB2
• Superconducting Properties of adipic acid doped Bulk MgB2 Superconductor
• High quality MgB2 thin films in-situ grown by dc magnetron sputtering
• Magneto Seebeck effect in REFeAsO (RE=rare earth) compounds: probing the magnon drag scenario
• Experimental investigation of electronic interactions in collapsed and uncollapsed LaFe2As2 phases
• Band filling and disorder effects on the normal state thermoelectric behavior in MgB2
• The uncollapsed LaFe2As2 phase: compensated, highly doped, electron-phonon coupled, iron-based superconductor
• Einstein and Debye temperatures, electron-phonon coupling constant and a probable mechanism for ambient-pressure room-temperature superconductivity in intercalated graphite