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首页> 外文期刊>Physica, C. Superconductivity and its applications >Vortex creep characteristics via magnetic relaxation of Bi2Sr2CaCu2O8+delta crystals
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Vortex creep characteristics via magnetic relaxation of Bi2Sr2CaCu2O8+delta crystals

机译：Bi2Sr2CaCu2O8 +δ晶体的磁弛豫涡蠕变特性

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摘要

The vortex activation energy U(B,J) proportional to B(v)J(-mu) similar to (HM-mu)-M-v, where J and M are the current and the magnetization, respectively, in Bi,Sr2CaCu2O8+delta is investigated via magnetic relaxation measured by a miniature Hall sensor. The exponent mu at the low-field solid phase is definitively observed to be -1/7, which is consistent with the single-vortex collective creep. With increasing H, plastic creep is observed just above H,,, if the measurement is performed after a sufficiently long waiting time. On the other hand, with increasing T below H-on, the mu decreases abruptly at 4 piM(dp) similar to 5 G near the depinning temperature T-dp. The kink at M-dp is attributed to a change in the creep character from that controlled by the bulk pinning into that controlled by the surface pinning. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 37]
机译：类似于（HM-mu）-Mv的与B（v）J（-mu）成比例的涡旋活化能U（B，J），其中J和M分别是Bi，Sr2CaCu2O8 +δ中的电流和磁化强度通过由微型霍尔传感器测得的磁弛豫来研究电磁波。最终观察到低场固相的指数μ为-1/7，这与单涡旋集体蠕变一致。如果在足够长的等待时间后进行测量，则随着H的增加，会观察到刚好高于H的塑性蠕变。另一方面，随着T在H-on以下升高，mu在4 piM（dp）突然降低，类似于在钉扎温度T-dp附近的5G。 M-dp处的扭结归因于蠕变特性从由体钉扎控制到由表面钉扎控制的变化。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：37]

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