Heat Capacity of Single Crystal CuxTiSe2 Superconductors

J. Kacmarcik; Z. Pribulova; V. Paluchova; P. Szabo; P. Husanikova; G. Karapetrov; P. Samuely

doi:10.1103/PhysRevB.88.020507

paper

Heat Capacity of Single Crystal CuxTiSe2 Superconductors

arXiv:1308.2290 · doi:10.1103/PhysRevB.88.020507

Abstract

We present heat capacity measurements on a series of superconducting Cu $_{x}$ TiSe $_{2}$ 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 electronic heat capacity as a function of normalized temperature $T / T_{c}$ 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 $2Δ/ k_{B} T_{c}$ = 3.7 for all samples.

5 pages, 4 figures

References in corpus (3)

Emergence of Fermi pockets in an excitonic CDW melted novel superconductor
Specific-heat measurements of superconducting NbS2 single crystal in an external magnetic field: Study on the energy gap structure
Superconducting energy gap in MgCNi3 single crystals: Point-contact spectroscopy and specific-heat measurements

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