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Disordered nanocrystalline superconducting PbMo6S8 with a very large upper critical field.

By H. J. Niu and D. P. Hampshire


Large increases in the upper critical field B-C2(0) are reported in\ud bulk superconductors that demonstrate another novel property for\ud nanocrystalline materials. Disordered nanocrystalline PbMo6S8\ud superconductors were fabricated by mechanical milling and hot isostatic\ud pressing. Conventional PbMo6S8 has B-C2(0)similar to50 T. The\ud nanocrystalline materials have higher resistivity (rho(N)) and\ud B-C2(0)similar to100 T. The disorder produced in these nanocrystalline\ud materials is significantly different from that produced by doping\ud because it increases rho(N) and, hence, B-C2(0) without significantly\ud reducing the electronic density of states or superconducting transition\ud temperature (T-C). Furthermore, the disorder reduces the electron\ud mean-free path to similar to1 nm which is more than an order of\ud magnitude smaller than the grain size and necessary to achieve the\ud unprecedented increase in B-C2(0)

Topics: Critical-current-density, NB, Temperatures, Parameters, NB3SN, Films, Spins, Heat.
Publisher: American Physical Society
Year: 2003
DOI identifier: 10.1103/PhysRevLett.91.027002
OAI identifier:

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