Peak effect in laser ablated DyBa2Cu3O7-d films at microwave frequencies at subcritical currents

Details Peak effect in laser ablated DyBa2Cu3O7-d films at microwave frequencies at subcritical currents Peak effect in laser ablated DyBa2Cu3O7-d films at microwave frequencies at subcritical currents

2000-11-16

arxiv.org/abs/cond-mat/0011277v1

Physics

Condensed Matter

Superconductivity

8 pages, 2 pages (accepted for publication in JAP, Intermag symposium proceeding)

Scientific paper

10.1063/1.1356046

In this paper we report the observation of a peak in the microwave surface resistance (at frequencies ~10GHz) of laser ablated DyBa2Cu3O7-d films in magnetic field ranging from 2 to 9kOe (||c) close to the superconducting transition temperature (Tc(H)). The exact nature of peak is sample dependent but it follows a general behaviour. The peak shifts to lower temperature when the magnetic field is increased. It has strong frequency dependence and the peak is pronounced at frequencies close to the depinning frequency of the flux line lattice. From the observed temperature and field dependence we argue that this peak is associated with the order disorder transition of the flux line lattice close to Tc(H).

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