Magnetization Properties and Vortex Phase Diagram in CuxTiSe2 Single Crystals
Husanikova, P. · Fedor, J. · Derer, J. · Soltys, J. · Cambel, V. · Iavarone, M. · May, S. J. · Karapetrov, G.
Original · EN
We have investigated the magnetization properties and flux dynamics of superconducting CuₓTiSe₂ single crystals within wide range of copper concentrations. We find that the superconducting anisotropy is low and independent on copper concentration (γ 1.7), except in the case of strongly underdoped samples (x≤0.06) that show a gradual increase in anisotropy to γ 1.9. The vortex phase diagram in this material is characterized by broad region of vortex liquid phase that is unusual for such low-Tc 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 (Jc/J₀ 10⁻⁷). All this points out that local fluctuations in copper concentration have little effect on bulk pinning properties in this system.
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