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Far-infrared optical properties of the heavy fermion superconductor UB[E13]

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Show simple item record Brown, Adán. en_US 2009-07-09T17:35:27Z 2009-07-09T17:35:27Z 2001-07-09T17:35:27Z
dc.description.abstract Temperature dependent resistivity, p, magnetic susceptibility, X, and far-infrared reflectance measurements were made on the low Tc superconductor UBe13. Two variants of UBe13 have been proposed, named 'L'- (for low Tc ) and 'H'-type (for high Tc ). Low temperature resistivity measurements confirmed that our sample was of H-type and that the transition temperature was at 0.9 K. This was further confirmed with the observation of this transition in the AC-susceptibility. Low temperature reflectance measurements showed a decrease in the reflectivity as the temperature is lowered from 300 to 10 K, which is in qualitative agreement with the increasing resistivity in this temperature range as temperature is lowered. No dramatic change in the reflectivity was observed between 10 and 0.75 K. A further decrease of the reflectance was observed for the temperature of 0.5 K. The calculated optical conductivity shows a broad minimum near 80 cm-1 below 45 K. Above 45 K the conductivity is relatively featureless. As the temperature is lowered, the optical conductivity decreases. The frequency dependent scattering rate was found to be flat for temperatures between 300 and 45 K. The development of a peak, at around 70 cm-1 was found for temperatures of 45 K and below. This peak has been associated with the energy at which the transition to a coherent state occurs from single impurity scattering in other heavy fermion systems. The frequency dependent mass enhancement coefficient was found to increase at low frequencies as the frequency decreases. Its' magnitude as frequency approaches zero also increased as the temperature decreased. en_US
dc.language.iso eng en_US
dc.publisher Brock University en_US
dc.subject Fermions. en_US
dc.subject Heavy particles (Nuclear physics) en_US
dc.subject Superconductors. en_US
dc.subject Infrared spectroscopy. en_US
dc.title Far-infrared optical properties of the heavy fermion superconductor UB[E13] en_US
dc.type Electronic Thesis or Dissertation en_US M.Sc. Physics en_US Masters en_US
dc.contributor.department Department of Physics en_US Faculty of Mathematics and Science en_US

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