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 (Rogacki et al., 2006) [1]. The present work reports on the influence of the Mo substitution and high-pressure oxygen annealing on the pinning properties and critical currents of YBa₂Cu_3-xMo_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.

我们以前对粉末表明，将Mo代入YBa ₂ Cu ₃ O ₇的CuO链中可以产生有效的钉扎中心，从而显着提高7 T场中的临界电流密度（j _c），在50和50℃时分别增加4和10倍。分别为60 K（Rogacki et al。，2006）[1]。本工作报道了钼替代和高压氧退火对YBa ₂ Cu _3-x Mo _x O _7-d的钉扎性能和临界电流的影响。通过比较纯（x = 0，d> 0）和取代（x = 0.03，d <0）单晶。钉扎性能已经通过磁化线圈和的计算的测量研究Ĵ _Ç在AB -平面，在温度范围从2到90 K和在字段高达14 T.取决于沫取代和氧处理，几种类型在Dew-Hughes和Kramer模型的框架中，揭示并分析了增加j _c的钉扎中心。