Isothermal magnetization curves above the transition temperature T-c in a single crystal of superconducting underdoped cuprate La1.9Sr0.1CuO4 are reported. In the low-field range, H <= 1 kOe, and for T within Tc + 2 K, evidence is given of a fluctuating diamagnetism different from the one expected from the Ginzburg-Landau theory infinite fields. The experimental findings are related to phase fluctuations of order parameter in "droplets" having local Tc(loc) higher than the bulk resistive Tc, a general phenomenon in cuprates and intrinsic consequence of charge inhomogeneities at mesoscopic level. The temperature dependence of the droplets size suggests a percolative character of the transition.

On the character of the fluctuating diamagnetism above the superconducting transition in La1.9Sr0.1CuO4

LASCIALFARI, ALESSANDRO;RIGAMONTI, ATTILIO;ZUCCA, ILEANA
2004-01-01

Abstract

Isothermal magnetization curves above the transition temperature T-c in a single crystal of superconducting underdoped cuprate La1.9Sr0.1CuO4 are reported. In the low-field range, H <= 1 kOe, and for T within Tc + 2 K, evidence is given of a fluctuating diamagnetism different from the one expected from the Ginzburg-Landau theory infinite fields. The experimental findings are related to phase fluctuations of order parameter in "droplets" having local Tc(loc) higher than the bulk resistive Tc, a general phenomenon in cuprates and intrinsic consequence of charge inhomogeneities at mesoscopic level. The temperature dependence of the droplets size suggests a percolative character of the transition.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/148185
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