Fluctuation Study of the Specific Heat of MgB2

Details Fluctuation Study of the Specific Heat of MgB2 Fluctuation Study of the Specific Heat of MgB2

2002-04-10

arxiv.org/abs/cond-mat/0204233v2

Physics

Condensed Matter

Superconductivity

Phys. Rev. B 66, 134515 (2002)

Scientific paper

10.1103/PhysRevB.66.134515

The specific heat of polycrystalline Mg$^{11}$B$_{2}$ has been measured with high resolution ac calorimetry from 5 to 45 K at constant magnetic fields. The excess specific heat above T$_{c}$ is discussed in terms of Gaussian fluctuations and suggests that Mg$^{11}$B$_{2}$ is a bulk superconductor with Ginzburg-Landau coherence length $\xi_{0}=26$ \AA . The transition-width broadening in field is treated in terms of lowest-Landau-level (LLL) fluctuations. That analysis requires that $\xi_{0}=20$ \AA . The underestimate of the coherence length in field, along with deviations from 3D LLL predictions, suggest that there is an influence from the anisotropy of B$_{c2}$ between the c-axis and the a-b plane.

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