Mechanisms of influence of external and internal demagnetization fields on the formation, dynamics, and evolution of vortex structure in twinned YBa₂Cu₃O₇₋ₓ high temperature superconductors

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Resumo

It is shown that in twinned YBa2Cu3O7–x, first large vortex “molecules” pinned at the intersection points of periodic twin boundaries are formed. Low-mobility molecules of similar shape consist of intratwin junction vortices and intertwin junction antivortices, between which Abrikosov and Josephson vortices trapped at the banks of twin boundaries and in twinning boundaries, respectively, are “sandwiched”. An increase in the field leads to an increase in its interaction with the residual demagnetization fields of twins and to the decay of multicomponent vortex molecules into smaller two-component molecules.

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Sobre autores

Kh. Rostami

Kotel’nikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Fryazino Branch

Autor responsável pela correspondência
Email: rostami@ms.ire.rssi.ru
Rússia, Fryazino, 141190

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2. Fig. 1. Schematic representation of the distribution of fields Ho, HD and Heff around the sample, currents Jcji and Jcgi.

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3. Fig. 2. For the YBCO sample the following are shown: magnetic field dependence Нi(Нo) (a); dependence JS(Нi) on a semi-logarithmic scale (b).

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4. Fig. 3. Distribution of the density of Meissner screening currents of twins Jcg, density of critical pinning currents of twins Jcg, dynamics of occurrence and transformation of VDSW and MDSAW with increasing field H(t). 1 – MDSAW, 2 – VDSW, 3 – Josephson vortices, 4 – Abrikosov vortices (a); 5, 6 – cores of VDSW and MDSAW; 7, 8 – regions of closure of VDSW and MDSAW currents through GD (b).

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5. Fig. 4. Magnetic field dependences of transverse dimensions: MDSAV – a(Hi) (a); twins ag(Hi) (b).

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