Negative thermal expansion of MgB$_{2}$ in the superconducting state and anomalous behavior of the bulk Grüneisen function

Details Negative thermal expansion of MgB$_{2}$ in the superconducting state and anomalous behavior of the bulk Grüneisen function Negative thermal expansion of MgB$_{2}$ in the superconducting state and anomalous behavior of the bulk Grüneisen function

2005-10-19

arxiv.org/abs/cond-mat/0510515v1

Physics

Condensed Matter

Superconductivity

5 figures. submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevB.72.220505

The thermal expansion coefficient $\alpha$ of MgB$_2$ is revealed to change from positive to negative on cooling through the superconducting transition temperature $T_c$. The Gr\"uneisen function also becomes negative at $T_c$ followed by a dramatic increase to large positive values at low temperature. The results suggest anomalous coupling between superconducting electrons and low-energy phonons.

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