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arXiv 1109.5367cond-mat.supr-con
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低磁场中La_{1.83} Sr_{0.17} CuO_{4}混合态的μ子自旋旋转和磁化实验研究

Study of the mixed state of La_{1.83}Sr_{0.17}CuO_{4} by means of muon-spin rotation and magnetization experiments in a low magnetic field

B. M. Wojek, S. Weyeneth, S. Bosma, E. Pomjakushina, R. Puzniak

摘要:

μ子自旋旋转(muSR)实验是研究第二类超导体涡旋态磁场分布的常用方法。基于磁穿透深度的测定,人们经常推测-也有争议-所研究的超导体的序参量对称性。本文报道了在沿单晶c轴施加的20 mT的低磁场中,对铜酸盐高温超导体La_{1.83} Sr_{0.17} CuO_{4}中的混合态进行的muSR和磁化联合研究。宏观磁化测量揭示了各种冷却程序的实质性差异。然而,不同温度区域之间的涡流动力学变化以及微观muSR实验的结果几乎与所采用的冷却循环无关。此外,它被发现的平均磁通量密度,局部探测的μ子,强烈增加,在低温下。这可能是由于在这种铜氧化物超导体中,涡旋晶格的空间场分布的非随机抽样所导致的涡旋钉扎的增强而引起的。

英文摘要:

Muon-spin rotation (muSR) experiments are often used to study the magnetic field distribution in type-II superconductors in the vortex state. Based on the determination of the magnetic penetration depth it is frequently speculated---also controversially---about the order-parameter symmetry of the studied superconductors. This article reports on a combined muSR and magnetization study of the mixed state in the cuprate high-temperature superconductor La_{1.83}Sr_{0.17}CuO_{4} in a low magnetic field of 20 mT applied along the c axis of a single crystal. The macroscopic magnetization measurements reveal substantial differences for various cooling procedures. Yet, indicated changes in the vortex dynamics between different temperature regions as well as the results of the microscopic muSR experiments are virtually independent of the employed cooling cycles. Additionally, it is found that the mean magnetic flux density, locally probed by the muons, strongly increases at low temperatures. This can possibly be explained by a non-random sampling of the spatial field distribution of the vortex lattice in this cuprate superconductor caused by intensified vortex pinning.

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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