Giant Peak Effect Observed in Ultrapure YBCO Crystal

Details Giant Peak Effect Observed in Ultrapure YBCO Crystal Giant Peak Effect Observed in Ultrapure YBCO Crystal

1999-11-01

arxiv.org/abs/cond-mat/9910523v1

Phys. Rev. B (Rapid Communications) vol.40, R12593 (1999)

Physics

Condensed Matter

Superconductivity

4 pages

Scientific paper

10.1103/PhysRevB.60.R12593

A giant peak in the temperature dependence of the screening current is observed in the ac magnetic response of an ultra-pure YBa$_2$Cu$_3$O$_{6.993}$ crystal in a magnetic field. At H = 2.0 T ({\bf $H$}$||${\bf c}), the screening current density $J_c(T)$ exhibits a 35-fold rise with 0.5 K increase in temperature, indicating an abrupt $10^3$-fold collapse in the characteristic volume of ordered regions in the vortex array. The peak-effect anomaly is most pronounced for $H<$ 4.0 T, but detectable up to 7.0 T. The temperature dependence of the equilibrium magnetization exhibits a small discontinuous jump (for high fields) inside the peak-effect regime, suggesting that the underlying phase transition is a weak first-order vortex-lattice melting transition.

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