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    Magnetic and high pressure studies in the YPd5B3C3 system

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    Author
    Murdoch, Jim.
    Keyword
    Superconductivity.
    Superconductors--Magnetic properties.
    
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    URI
    http://hdl.handle.net/10464/1940
    Abstract
    The macroscopic properties of the superconducting phase in the multiphase compound YPd5B3 C.3 have been investigated. The onset of superconductivity was observed at 22.6 K, zero resistance at 21.2 K, the lower critical field Hel at 5 K was determined to be Hel (5) rv 310 Gauss and the compound was found to be an extreme type-II superconductor with the upper critical field in excess of 55000 Gauss at 15 K. From the upper and lower critical field values obtained, several important parameters of the superconducting state were determined at T = 15 K. The Ginzburg-Landau paramater was determined to be ~ > 9 corresponding to a coherence length ~ rv 80A and magnetic penetration depth of 800A. In addition measurements of the superconducting transition temperature Te(P) under purely hydrostatically applied pressure have been carried out. Te(P) of YPd5B3 C.3 decreases linearly with dTe/dP rv -8.814 X 10-5 J</bar. The discussion of Te(P) will focus on the influence pressure has on the phonon spectrum and the density of states near the Fermi level.
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