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Magnetic Phase Diagram of Li_2(Pd_{1-x}Pt_x)_3B by AC Susceptometry

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arxiv 1105.6281 v1 pith:5Y5H2KCK submitted 2011-05-31 cond-mat.supr-con

classification cond-mat.supr-con
keywords diagramphasehighsuperconductingabsenceanomalouslyapparentlyaspects
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The H-T phase diagram and several superconducting parameters for Li_2(Pd_{1-x}Pt_x)_3B have been determined as a function of cation substitution x. Notably, the coherence length may be linear in platinum concentration. Despite the superconducting pairing state and band structure apparently changing fundamentally, the H-T phase diagram is essentially unchanged. Unusual aspects of the shape of the H-T phase diagram are discussed. The upper critical field H_c2(0) is not anomalously high for any Pt content, likely due to an absence of high carrier masses - in such a case, the value of H_c2(0) would not serve as a probe for novel physics.

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