Thermal conductivity of single crystalline MgB_2

Details Thermal conductivity of single crystalline MgB_2 Thermal conductivity of single crystalline MgB_2

2002-01-28

arxiv.org/abs/cond-mat/0201517v3

Phys. Rev. B 66, 014504 (2002)

Physics

Condensed Matter

Superconductivity

9 pages,7 figures

Scientific paper

10.1103/PhysRevB.66.014504

The ab-plane thermal conductivity $\kappa$ of single-crystalline hexagonal MgB_2 has been measured as a function of magnetic field H with orientations both parallel and perpendicular to the c-axis and at temperatures between 0.5 and 300 K. In the mixed state, $\kappa(H)$ measured at constant temperatures reveals features that are not typical for common type-II superconductors. The observed behavior may be associated with the field-induced reduction of two superconducting energy gaps, significantly different in magnitude. A nonlinear temperature dependence of the electronic thermal conductivity is observed in the field-induced normal state at low temperatures. This behavior is at variance with the Wiedemann-Franz law, and suggests an unexpected instability of the electronic subsystem in the normal state at T ~ 1 K.

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