Effect of Non-Stoichiometry of High-Temperature Superconductors of the Composition Gd1 + xBa2 – yCu3O7 – δ on Vortex Pinning and on the Vortex Liquid–Glass Phase Transition

IF 1.3 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

JETP Letters Pub Date : 2025-07-14 DOI:10.1134/S0021364025606116

B. I. Massalimov, V. A. Vlasenko, A. R. Prishchepa, P. N. Degtyarenko, E. M. Ivanova, A. V. Sadakov

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Abstract

High-temperature superconducting film samples of the non-stoichiometric composition Gd_1+xBa_2–yCu₃O_7–δ have been systematically studied. The measured R(T) curves in magnetic fields have demonstrated a sharp change in the nature of pinning with the field, which indicates a possible phase transition of the pinned vortex system from a three-dimensional state to a quasi-two-dimensional one. The vortex structure pinning has been described within the thermally activated flux flow model. The analysis of the dependence of the vortex activation energy U₀(B) on the magnetic field has indicated that the influence of thermal fluctuations on the vortex system in non-stoichiometric high-temperature superconductors Gd_1+xBa_2–yCu₃O_7–δ is smaller than that in stoichiometric superconductors of a similar composition.

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Gd1 + xBa2 - yCu3O7 - δ高温超导体非化学计量学对涡旋钉钉和涡旋液-玻璃相变的影响

对非化学计量组成Gd1+ xBa2-yCu3O7 -δ的高温超导膜样品进行了系统的研究。实测的磁场中的R(T)曲线显示出钉住涡旋的性质随磁场的变化而急剧变化，这表明钉住涡旋系统可能从三维状态转变为准二维状态。在热激活通量流模型中描述了涡旋结构钉住。对涡旋活化能U0(B)对磁场的依赖性分析表明，在非化学计量高温超导体Gd1+ xBa2-yCu3O7 -δ中，热波动对涡旋系统的影响小于相同成分的化学计量超导体。

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来源期刊

JETP Letters 物理-物理：综合

CiteScore

2.40

自引率

30.80%

发文量

164

审稿时长

3-6 weeks

期刊介绍： All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.