Diamagnetism of YBa${}_2$Cu${}_3$O${}_{6+x}$ crystals above $T_c$~: evidence for Gaussian fluctuations

Abstract

The magnetization of three high-quality single crystals of YBa${}_2$Cu${}_3$O${}_{6+x}$, from slightly overdoped to heavily underdoped,has been measured using torque magnetometry. Striking effects in the angular dependence of the torque for the two underdoped crystals, a few degrees above the superconducting transition temperature ($T_c$) are described well by the theory of Gaussian superconducting fluctuations using a single adjustable parameter. The data at higher temperatures ($T$) are consistent with a strong cut-off in the fluctuations for $T\gtrsim 1.1T_c$. Numerical estimates suggest that inelastic scattering could be responsible for this cut-off.

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References in corpus (4)

• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Decrease of upper critical field with underdoping in cuprate superconductors
• A length scale for the superconducting Nernst signal above T${}_c$ in Nb${}_{0.15}$Si${}_{0.85}$
• Fluctuation diamagnetism in high temperature superconductors

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