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

Niu, H. J. and Hampshire, D. P. (2003) 'Disordered nanocrystalline superconducting PbMo6S8 with a very large upper critical field.', Physical review letters., 91 (2). 027002.


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

Item Type:Article
Keywords:Critical-current-density, NB, Temperatures, Parameters, NB3SN, Films, Spins, Heat.
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Publisher statement:© 2003 by The American Physical Society. All rights reserved.
Record Created:27 Nov 2006
Last Modified:13 Sep 2010 14:20

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