Heat Capacity of MgB_2: Evidence for Moderately Strong Coupling Behavior

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We characterize the superconducting state of phase pure polycrystalline samples of the new layered superconductor MgB$_2$ by specific heat measurements in magnetic fields up to 9 T. The characteristic jump at the superconducting transition is observed and compared with the predictions of weak coupling BCS-theory and the $α$-model. Our analysis shows excellent agreement with the predictions for 2$Δ/k_BT_{\rm C}$ = 4.2(2) with a Sommerfeld term $γ_{\rm exp}$ of 3.1(1) mJ/mol K$^2$ indicating that MgB$_2$ is a superconductor in the moderately strong electron-phonon coupling regime.
10 pages, 3 figures. RevTeX. Submitted to Phys. Rev. Lett

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/17403

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0102432
 http://arxiv.org/abs/cond-mat/0102432

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arXiv