Low Temperature Physics: 36, 105 (2010); https://doi.org/10.1063/1.3294477 (5 pages)
Fizika Nizkikh Temperatur: Volume 36, Number 1 (January 2010), p. 131-136    ( to contents , go back )

Static and dynamic order-disorder transitions of the vortex lattice in YBa2Cu3O7-d crystals: the effect of point defects, anisotropy, temperature and magnetic field

Yu.T. Petrusenko

National Science Center "Kharkov Institute of Physics and Technology", Akhiezer Institute for Theoretical Physics 1 Akademicheskaya Str., Kharkov 61108, Ukraine
E-mail: petrusenko@kipt.kharkov.ua
pos Анотація:

Received August 10, 2009, revised September 22, 2009

Abstract

The experimental data on field Fp (H) and angular Fp(α) dependences of pinning force in the YBa2Cu3O7–δ crystal with different concentrations of point defects are reported. Comparison of the Fp(H) and Fp (α) dependences gives strong arguments to suggest that minimum in the Fp (α) dependence measured at low vortex velocity u corresponds to the order–disorder transition of the vortex lattice (VL). It is also shown that high velocities result in shifting the minimum towards higher values of angle α, due to a partial dynamic ordering of the disordered VL.

PACS: 74.25.Qt Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses);
PACS: 74.25.Wx Vortex pinning (includes mechanisms and flux creep);
PACS: 74.72.–h Cuprate superconductors.

Key words: superconductivity, vortexes, phase transitions, dynamics, single crystals.

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