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Ginsberg, D.M. Miller, William Michael 2011-06-06T18:31:38Z 2011-06-06T18:31:38Z 10000-01-01 1984 We have measured the superconducting transition temperature, Tc' and the upper critical field, Hc2 (T), of manganese-doped SnMo6S8 (MnxSn1_xMo6S8)' These samples had reproducible superconducting properties. They were characterized by x-ray powder diffractometry, optical microscopy. electron microscopy, and electron microprobe work. The transition temperature decreased slow1~ with increasing manganese content until x=O.06. It then increased until x=O.10. after which it fell slow1~ again. Manganese would norma11y have strong pair-breaking effects on the quasipartic1es, but our results provide an exception. X-ray Absorbtion Near-Edge Structure (XANES) measurements showed that the manganese exists as Mn+6 in our compound. Six of its seven valence electrons are transfered to the MoS 68 clusters of the compound. As Mn+6 has on1~ one valence electron in the 3-d orbital we expect it to be on1y slight1y magnetic. This helps to explain the low rate of T c depression. T for these compounds is dependent on the number c of electrons available to the mo1ibdenum atoms, and it peaks when this number is optimized. The peak in the T curve is c explained b~ considering the extra electrons transfered to the mo1ibdenum as the manganese doping is increased. H(T) curves upward from 0 to 15 kOe and is linear from c2 15 to 30 kOe. The curvature of the low-field section increases as the manganese doping is raised from x=O.O to x=0.06. Above x=0.06 the curvature does not change. The slope of the linear section does not vary with manganese content. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-06T18:31:38Z No. of bitstreams: 1 1984_miller.pdf: 3194441 bytes, checksum: c6396e69c916b7f925c4208a81ad442d (MD5) Made available in DSpace on 2011-06-06T18:31:38Z (GMT). No. of bitstreams: 1 1984_miller.pdf: 3194441 bytes, checksum: c6396e69c916b7f925c4208a81ad442d (MD5) Previous issue date: 1984 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-06T18:31:38Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:17:34-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 826557 http://hdl.handle.net/2142/25307 en 1984 William Michael Miller manganese doping superconducting transition temperature upper critical field tin-molybdenum-sulfide x-ray powder diffractometry optical microscopy electron microscopy electron microprobe The effect of manganese doping on the superconducting transition temperature and the upper critical field of tin-molybdenum-sulfide Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.