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arXiv 2103.00447cond-mat.supr-con
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Mo替代和高压氧退火提高YBa2Cu3O7临界电流

Increase of YBa2Cu3O7 critical currents by Mo substitution and high pressure oxygen annealing

Anton Los, Bogdan Dabrowski, Krzysztof Rogacki

摘要:

我们以前已经证明,Mo取代到YBa_2Cu_3O_7的CuO链中可以产生有效的钉扎中心,在7 T场下,在50和60 K下,它们分别使临界电流密度(j_c)增加4和10倍。本文报道了Mo替代和高压氧退火对YBa_2 Cu_{3-x} Mo_ xO_{7-d}的钉扎性能和临界电流的影响。通过测量ab平面内的磁化曲线和计算j_c,研究了在2 ~ 90 K温度范围和14 T磁场下的钉扎特性。在Dew-Hughes和Kramer模型的框架下,根据Mo替代和氧处理的不同,揭示和分析了几种增加j_c的钉扎中心。

英文摘要:

We have previously shown for powders that Mo substitution into the CuO chains of YBa2Cu3O7 can create effective pinning centres which significantly increase the critical current density (j_c) in 7 T field by a factor of 4 and 10 at 50 and 60 K, respectively. The present work reports on the influence of the Mo substitution and high-pressure oxygen annealing on the pinning properties and critical currents of YBa_2Cu_{3-x}Mo_xO_{7-d} by comparing pure (x = 0, d > 0) and substituted (x = 0.03, d < 0) single crystals. Pinning properties have been investigated by measurements of magnetization loops and calculations of j_c in the ab-plane, in the temperature range from 2 to 90 K and in fields up to 14 T. Depending on the Mo substitution and the oxygen treatment, several types of pinning centres increasing j_c have been revealed and analysed in the frame of Dew-Hughes' and Kramer's models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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