Magnetization properties and vortex phase diagram of Cu-x TiSe2 single crystals

Article

关键词: CRITICAL-FIELD;    PURITY DEPENDENCE;    TEMPERATURE;    SUPERCONDUCTIVITY;   

DOI  :  10.1103/PhysRevB.88.174501

来源: SCIE

【 摘 要 】

We have investigated the magnetization properties and flux dynamics of superconducting Cu-x TiSe2 single crystals within a wide range of copper concentrations. We find that the superconducting anisotropy is low and independent on copper concentration (gamma similar to 1.7), except in the case of strongly underdoped samples (x <= 0.06) that show a gradual increase in anisotropy to gamma similar to 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) similar to 10(-7)). All this points out that local fluctuations in copper concentration have little effect on bulk pinning properties in this system.

【 授权许可】

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