Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 21, Issue 32, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/21/32/325701
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Specific heat measurements performed on high purity vapor-grown Nb3Sn crystals show clear features related to both the martensitic and superconducting transitions. Our measurements indicate that the martensitic anomaly does not display hysteresis, meaning that the martensitic transition could be a weak first-order or a second-order thermodynamic transition. Careful measurements of the two transition temperatures display an inverse correlation between them. At low temperature, specific heat measurements show the existence of a single superconducting energy gap feature.
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