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Ginsberg, D.M. Pazol, Brian George 2012-01-20T21:37:53Z 2012-01-20T21:37:53Z 10000-01-01 1988 The anisotropy of the upper critical field has been measured on deoxygenated single crystals of the Chevrel phases PbMo6Ss and Cu1.sMo6Ss. Data were taken with the applied field pointing in various directions in the hexagonal (2IO) and (001) planes. At each of a series of field values the superconducting transition temperature oscillated as a function of direction. Since the Hc2 versus T curve is linear in the field region we probed, the shape of the anisotropy in T c at constant H is the same as the anisotropy of the upper critical field, Hc2. at constant T. The data reflect the low temperature symmetry of the crystal structure. The PbMo6S8 data display two-fold symmetry in the (2TO) plane and no measurable anisotropy in the (001) plane. The data were fit to the effective mass model with uniaxial symmetry. A two-fold symmetry was observed in the Cu1.sMo6S8 in the (2TO) plane. Oscillations with three-fold symmetry have been observed for the first time in the (001) plane. The effective mass model was unable to explain the observed behavior, so the data were fit with an expansion of spherical harmonics with triclinic symmetry. Submitted by Carolyn Rauber (crauber2@illinois.edu) on 2012-01-20T21:37:53Z No. of bitstreams: 1 1988_pazol.pdf: 4062710 bytes, checksum: 263b7fe0bf5e7e92024a14faf35b8a5e (MD5) Made available in DSpace on 2012-01-20T21:37:53Z (GMT). No. of bitstreams: 1 1988_pazol.pdf: 4062710 bytes, checksum: 263b7fe0bf5e7e92024a14faf35b8a5e (MD5) Previous issue date: 1988 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Rauber (crauber2@illinois.edu) on 2012-01-20T21:37:53Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:11:27-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: dissertation dissertation U of I Only http://hdl.handle.net/2142/28672 en 1988 Brian George Pazol anisotropy upper critical field chevrel phase compounds The anisotropy of the upper critical field of chevrel phase compounds text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.