Specific heat studies of pure Nb3Sn single crystals at low temperature
arXiv:0907.0411 · doi:10.1088/0953-8984/21/32/325701
Abstract
Specific heat measurements performed on high purity vapor-grown Nb$_3$Sn 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 or a second order thermodynamic transition. Careful measurements of the two transition temperatures display an inverse correlation between both temperatures. At low temperature specific heat measurements show the existence of a single superconducting energy gap feature.
Accepted in Journal of Physics: Condensed Matter