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arXiv 1202.5359cond-mat.supr-con
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铜氧化物超导体La2-xSrxCuO4在量子临界点x = 1/9的非常规磁性phase diagram

Unconventional magnetic phase diagram of cuprate superconductor La2-xSrxCuO4 at quantum critical point x = 1/9

X. L. Dong, P. H. Hor, F. Zhou, Z. X. Zhao

摘要:

基于场冷磁化强度测量和临界拟合,我们提出了一个新的La 2-xSrxCuO 4在量子临界点x = 1/9附近的磁相图.发现了一个新的相边界Tm 2(H),它深埋在一级涡熔化线以下的涡固相。超导电性和反铁磁性之间的耦合在低于Tm ~ 2(H)时是吸引的,而在高于Tm ~ 2(H)时是排斥的。超导有序和静态反铁磁有序之间的吸引耦合提供了强有力的实验证据,证明反铁磁与铜酸盐的高温超导性在微观上共存并协同作用。

英文摘要:

We propose a new magnetic phase diagram of La2-xSrxCuO4 around a quantum critical point x = 1/9 based on field-cooled magnetization measurements and critical fittings. A new phase boundary Tm2(H) is discovered which buries deeply below the first order vortex melting line in the vortex solid phase. The coupling between superconductivity and antiferromagnetism is found to be attractive below Tm2(H) while repulsive above. The attractive coupling between superconducting order and static antiferromagnetic order provides compelling experimental evidence that the antiferromagnetism microscopically coexists and collaborates with the high temperature superconductivity in cuprates.

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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