Phonon contribution to the transport properties of single-crystal MgB2 -: art. no. 214513

We extract phonon contributions from the transport properties of a MgB2 single crystal. The temperature dependence of the in-plane resistivity is well explained by the Bloch-Gruneisen formula with the Debye temperature Theta(D)similar to400 K, taking into account an additional contribution of the E-2g phonon mode (similar to890 K). In the thermoelectric power, we find a phonon drag peak around 70 K, which gives a consistent estimation of Theta(D) with the resistivity result. The pressure dependence of the in-plane resistivity reveals a major contribution of the E-2g phonon mode to superconductivity.