Crossovers Between Elastic, Plastic and Quantum Creep in Two Dimensional YBa₂Cu₃O₇/PrBa₂Cu₃O₇ Superlattices

1998/02/24 by Xin Qiu, V. V. Moshchalkov, Qiu, X. G. +7
Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con) #Theoretical and Computational Physics

paper · pdf · doi:10.48550/arxiv.cond-mat/9802253

openalex publication_date 1998/02/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Two-dimensional(2D) vortex dynamics was studied in an YBa₂Cu₃O₇/ PrBa₂Cu₃O₇ superlattice by measuring the I-V characteristics. In the high current limit, 2D collective creep was observed with an activation energy characterized by U(j)=a j^u. A dislocation mediated vortex melting happened when the temperature increased. In the low current limit, the exponential growth of energy barrier for elastic motion was prohibited by the plastic deformation of vortices. A plateau in the resistive transition was observed, which was attributed to possible quantum tunneling of vortices. Our results suggest that a 2D vortex glass can not exist at any temperature, including T=0 K.

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