Defect-induced weak collective pinning in superconducting YB6 crystals

IF 2.9 4区 物理与天体物理 Q2 OPTICS
Z. Pribulová, M. Marcin, J. Kačmarčík, S. Gabáni, K. Flachbart, N. Shitsevalova, T. Mori, N. Sluchanko, M. Anisimov, V. Cambel, J. Soltýs, C. Marcenat, T. Klein, P. Samuely
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引用次数: 0

Abstract

In a previous study (2017 Phys. Rev. B 96 144501), a strong variation in the superconducting transition temperature T c of YB6 differing by a factor of two has been explained by a change in the density of yttrium and boron vacancies tuning the electron–phonon interaction. Here, by using an array of miniature Hall probes, we address the penetration of the magnetic field, pinning, and critical current density on a series of YB6 single crystals with T c variation between 4.25 and 7.35 K. The analysis of the superconducting and normal-state specific heat characteristics allowed us to determine T c and the stoichiometry of our samples. We observed almost no pinning in the most stoichiometric YB6 crystal with the lowest T c. Upon increasing the number of vacancies weak pinning appears, and the critical current density is enhanced following the increased transition temperature in a linear variation. We argue that such an increase is, within weak collective pinning theory, consistent with the increasing number of vacancies that serve as pinning centers.
超导YB6晶体中缺陷诱导的弱集体钉钉
在之前的一项研究(2017年)中。Rev. B 96 144501), YB6的超导转变温度T c的强烈变化有两倍的差异,这可以解释为钇和硼空位密度的变化调节了电子-声子相互作用。在这里,我们使用一个微型霍尔探针阵列,研究了一系列温度在4.25和7.35 K之间变化的YB6单晶上的磁场穿透、钉住和临界电流密度。通过对超导和正常状态比热特性的分析,我们可以确定样品的温度和化学计量。在温度最低、化学量最大的YB6晶体中,我们观察到几乎没有钉住现象。随着空位数量的增加,出现了弱钉住现象,临界电流密度随转变温度的升高呈线性变化。我们认为,在弱集体钉钉理论中,这种增加与作为钉钉中心的空缺数量的增加是一致的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.00
自引率
48.10%
发文量
53
审稿时长
3 months
期刊介绍: This journal is devoted to the rapidly advancing research and development in the field of nonlinear interactions of light with matter. Topics of interest include, but are not limited to, nonlinear optical materials, metamaterials and plasmonics, nano-photonic structures, stimulated scatterings, harmonic generations, wave mixing, real time holography, guided waves and solitons, bistabilities, instabilities and nonlinear dynamics, and their applications in laser and coherent lightwave amplification, guiding, switching, modulation, communication and information processing. Original papers, comprehensive reviews and rapid communications reporting original theories and observations are sought for in these and related areas. This journal will also publish proceedings of important international meetings and workshops. It is intended for graduate students, scientists and researchers in academic, industrial and government research institutions.
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