We present heat capacity measurements on a series of superconducting CuxTiSe2 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/Tc 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/kBTc = 3.7 for all samples.
@article{arxiv.1308.2290,
title = {Heat Capacity of Single Crystal CuxTiSe2 Superconductors},
author = {J. Kacmarcik and Z. Pribulova and V. Paluchova and P. Szabo and P. Husanikova and G. Karapetrov and P. Samuely},
journal= {arXiv preprint arXiv:1308.2290},
year = {2015}
}