Reversible magnetization and critical fluctuations in systematically doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals

Abstract

The temperature and field dependence of reversible magnetization have been measured on a YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystal at six different doping concentrations. It is found that the data above 2 T can be described by the scaling law based on the GL-LLL (lowest Landau level approach based on Ginzburg-Landau theory) critical fluctuation theory yielding the values of the slope of upper critical field $-\mathrm{d}{H}_{c2}(T)/\mathrm{d}T$ near $T_{\mathrm{c}}$. This set of values is self-consistent with that obtained in doing the universal scaling for the six samples. Based on a simple Ginzburg-Landau approach, we determined the doping dependence of the coherence length $\xi$ which behaves in a similar way as that determined from $\xi =\hslash v_{\mathrm{F}}/E_{\mathrm{sc}}$ with $E_{\mathrm{sc}}$ the superconducting energy scale. Our results may suggest a growing coherence length towards more underdoping.

4 pages, 4 figures

References in corpus (4)

• The pseudogap in high-temperature superconductors: an experimental survey
• Hole Doping Dependence of the Coherence Length in $L{a}_{2-x}S{r}_{x}Cu{O}_4$ Thin Films
• The same superconducting criticality for underdoped and overdoped La_{2-x}Sr_xCuO_4 single crystals
• Experimental observation of two-dimensional fluctuation magnetization in the vicinity of T_c for low values of the magnetic field in deoxygenated YBa_2Cu_3O_{7-x}

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• Superconducting fluctuation in FeSe investigated by precise torque magnetometry
• Evidence for 3D-xy critical properties in underdoped YBa2Cu3O7+x
• Anisotropic magnetotransport of superconducting and normal state in an electron-doped Nd_{1.85}Ce_{0.15}CuO_{4-δ} single crystal
• Muon Spin Relaxation and fluctuating magnetism in the pseudogap phase of YBa${}_2$Cu${}_3$O${}_y$
• Universality of the {\bf q}=1/2 Orbital Magnetism in the Pseudogap Phase of the High-$T_c$ superconductor $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6+\mathrm{x}}$