Specific heat of MgB_2 after irradiation

Details Specific heat of MgB_2 after irradiation Specific heat of MgB_2 after irradiation

2002-08-08

arxiv.org/abs/cond-mat/0208169v3

Physics

Condensed Matter

Superconductivity

11 pages text, 6 figures, accepted by Journal of Physics: Condensed Matter

Scientific paper

10.1088/0953-8984/15/6/315

We studied the effect of disorder on the superconducting properties of polycrystalline MgB_2 by specific-heat measurements. In the pristine state, these measurements give a bulk confirmation of the presence of two superconducting gaps with 2 Delta 0 / k_B T_c = 1.3 and 3.9 with nearly equal weights. The scattering introduced by irradiation suppresses T_c and tends to average the two gaps although less than predicted by theory. We also found that by a suitable irradiation process by fast neutrons, a substantial bulk increase of dH_{c2}/dT at T_c can be obtained without sacrificing more than a few degrees in T_c. The upper critical field of the sample after irradiation exceeds 28 T at T goes to 0 K.

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