Heat capacity of single-crystal Cu sub(x)TiSe sub(2) superconductors

We present heat capacity measurements on a series of superconducting Cu sub(x) TiSe sub(2) single crystals with different Cu content down to 600 mK and up to 1 T performed by ac microcalorimetry. The samples cover a large portion of the phase diagram from an underdoped to a slightly overdoped region...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-07, Vol.88 (2)
Main Authors: Kacmarcik, J, Pribulova, Z, Pal'uchova, V, Szabo, P, Husanikova, P, Karapetrov, G, Samuely, P
Format: Article
Language:English
Subjects:
Asymptotic properties
Condensed matter
Copper
Heat capacity
Phase diagrams
Single crystals
Specific heat
Superconductivity
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Summary:We present heat capacity measurements on a series of superconducting Cu sub(x) TiSe sub(2) single crystals with different Cu content down to 600 mK and up to 1 T performed by ac microcalorimetry. The samples cover a large portion of the phase diagram from an underdoped to a slightly overdoped region with an increasing superconducting critical temperature and the charge density wave (CDW) order gradually suppressed. The superconducting electronic heat capacity as a function of normalized temperature T/T sub(c) shows no difference regardless of the concentration of copper, i.e., regardless of how much the CDW order is developed in the samples. The data analysis reveals consistently a single s-wave gap with an intermediate coupling strength 2 Delta /k sub(B)T sub(c) [asymptotically =] 3.7 for all samples.
ISSN:1098-0121
1550-235X