Anomalous behavior of the flux line lattice of vibrating high-Tc superconductors at 30 K in magnetic fields parallel to the CuO2 planes

Y. Kopelevich; A. Gupta; P. Esquinazi

doi:10.1103/PhysRevLett.70.666

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Anomalous behavior of the flux line lattice of vibrating high-Tc superconductors at 30 K in magnetic fields parallel to the CuO2 planes

Y. Kopelevich, A. Gupta, P. Esquinazi

DOI 10.1103/PhysRevLett.70.666 · Physical Review Letters

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Abstract

We have measured the energy dissipation and pinning of the flux line lattice (FLL) of vibrating high-Tc superconducting crystals as a function of temperature, magnetic field, and angle θ between field and CuO2 planes. For Bi2Sr2CaCu2O8 and oxygen-deficient (Y0.94Gd0.06)Ba2Cu3O6.83 superconductors and for θ∼0° we observed an anomalous depinning of the FLL at ∼30 K. This anomaly cannot be explained by a thermally activated depinning mechanism and suggests the existence of a phase transition of the FLL.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90.5	Pressure not reported	unknown
(Y0.94Gd0.06)Ba2Cu3O6.83 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	67	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown