Differential-thermal analysis around and below the critical temperature T sub(c of various low-T) sub(c) superconductors: A comparative study

We present specific-heat data on the type-II superconductors V sub(3Si, LuNi) sub(2)B sub(2C and NbSe) sub(2) which were acquired with a low-temperature thermal analysis (DTA) technique. We compare our data with available literature data on these superconductors. In the first part we show that the D...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2008-11, Vol.468 (22), p.2254-2266
Main Authors: Reibelt, M, Schilling, A, Canfield, P C, Ravikumar, G, Berger, H
Format: Article
Language:English
Subjects:
Differential thermal analysis
High resolution
Phase transformations
Specific heat
Superconductivity
Superconductors
Temperature scales
Transition temperature (superconductivity)
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Summary:We present specific-heat data on the type-II superconductors V sub(3Si, LuNi) sub(2)B sub(2C and NbSe) sub(2) which were acquired with a low-temperature thermal analysis (DTA) technique. We compare our data with available literature data on these superconductors. In the first part we show that the DTA technique allows for fast measurements while providing a very high resolution on the temperature scale. Sharp features in the specific heat such as at the one at the transition to superconductivity are resolved virtually without instrumental broadening. In the second part we investigate the magnetic-field dependence of the specific heats of V sub(3Si and LuNi) sub(2)B sub(2C at a fixed temperature T = 7.5 K to demonstrate that DTA techniques also allow for sufficiently precise measurements of absolute values of c) sub(p) even in the absence of a sharp phase transition. The corresponding data for V sub(3Si and LuNi) sub(2)B sub(2C are briefly discussed.)
ISSN:0921-4534
DOI:10.1016/j.physc.2008.07.005