Abstract
We have investigated the magnetization properties and flux dynamics of superconducting Cu${}_{x}$TiSe${}_{2}$ single crystals within a wide range of copper concentrations. We find that the superconducting anisotropy is low and independent on copper concentration ($\ensuremath{\gamma}\ensuremath{\sim}1.7$), except in the case of strongly underdoped samples ($x\ensuremath{\le}0.06$) that show a gradual increase in anisotropy to $\ensuremath{\gamma}\ensuremath{\sim}1.9$. The vortex phase diagram in this material is characterized by a broad region of vortex liquid phase that is unusual for such a low-${T}_{c}$ superconductor with low anisotropy. Below the irreversibility line the vortex solid state supports relatively low critical current densities as compared to the depairing current limit (${J}_{c}/{J}_{0}\ensuremath{\sim}{10}^{\ensuremath{-}7}$). All this points out that local fluctuations in copper concentration have little effect on bulk pinning properties in this system.
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