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arXiv 1104.3693cond-mat.supr-concond-mat.str-el
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Fulde-Ferrell-Larkin-Ovchinnikov超导体中反铁磁序的Ginzburg-Landau分析

Ginzburg-Landau Analysis for the Antiferromagnetic Order in the Fulde-Ferrell-Larkin-Ovchinnikov Superconductor

Youichi Yanase, Manfred Sigrist

摘要:

基于Ginzburg-Landau理论研究了Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)超导体中的无公度反铁磁(AFM)有序.我们建立了二分量Ginzburg-Landau模型,讨论了四元晶体结构中的两个简并无公度AFM态。由于FFLO态的平移对称性破缺,在[100]或[010]方向的磁场作用下,得到了单q相和双q相的多重相图。本文研究了重费米子超导体CeCoIn_5各相的磁性质,并与中子散射和核磁共振测量结果进行了比较。超声测量提出了未来的实验研究,以确定AFM-FFLO状态。讨论了CeCoIn_5中原子力显微镜(AFM)有序度与场取向的关系。

英文摘要:

Incommensurate antiferromangetic (AFM) order in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconductor is investigated on the basis of the Ginzburg-Landau theory. We formulate the two component Ginzburg-Landau model to discuss two degenerate incommensurate AFM states in the tetragonal crystal structure. Owing to the broken translation symmetry in the FFLO state, a multiple phase diagram of single-q phase and double-q phase is obtained under the magnetic field along [100] or [010] direction. Magnetic properties in each phase are investigated and compared with the neutron scattering and NMR measurements for a heavy fermion superconductor CeCoIn_5. An ultrasonic measurement is proposed for a future experimental study to identify the AFM-FFLO state. The field orientation dependence of the AFM order in CeCoIn_5 is discussed.

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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