Study of superconducting properties of MgB2

Details Study of superconducting properties of MgB2 Study of superconducting properties of MgB2

2002-07-29

arxiv.org/abs/cond-mat/0207658v2

Phys. Rev. B, 67 (2003) 094507

Physics

Condensed Matter

Superconductivity

6 pages, 10 figures

Scientific paper

10.1103/PhysRevB.67.094507

We synthesized single crystalline and policrystalline MgB_2 under ambient pressures. The single crystals of MgB_2 were of good quality, where the crystal structure refinements were successfully converged with R = 0.020. The specific heat of policrystalline MgB_2 samples has been measured in a temperature range between 2 and 60 K in magnetic field up to 6 T. The measurement gave the coefficient of the linear term in the electronic specific heat, gamma = 3.51 mJ/K^2 mol, and the jump of the specific heat, 2.8 mJ/K^2 mol at 38.5 K. It is shown from the analysis of the specific heat that the electronic specific heat in the superconducting state differs largely from the conventional BCS weak coupling theory. From the results of measurements of the magnetic properties on single crystal samples, we found a sharp superconducting transition at 38 K with transition width Delta Tc = 0.8 K and the superconducting anisotropy ratio gamma increasing from about 1 near Tc to 4.0 at 25 K.

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