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arXiv 1104.2670cond-mat.supr-concond-mat.str-el
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CeCoIn_5的Fulde-Ferrell-Larkin-Ovchinnikov态的反铁磁相

Antiferromagnetic Phases in the Fulde-Ferrell-Larkin-Ovchinnikov State of CeCoIn_5

Youichi Yanase, Manfred Sigrist

摘要:

基于Ginzburg-Landau理论,分析了Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)超导态的反铁磁序.为了研究CeCoIn_5中可能的AFM-FFLO态,我们专注于四元晶体结构中由波矢Q = Q_{0} \pm q_inc表征的无公度AFM阶,其中Q_0 =(π,π,π)和q_inc \parallel [1 - 10]或[1-10]。我们建立了两分量的Ginzburg-Landau理论,并研究了两个简并的无公度原子力显微镜级。我们发现,由于FFLO节面钉扎的AFM力矩导致沿[100]或[010]在磁场中的多个相位。为了与CeCoIn_5进行比较,示出了两个序参量之间的各种耦合常数的相图。核磁共振和中子散射测量的实验结果进行了讨论。

英文摘要:

The antiferromagnetic (AFM) order in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting state is analyzed on the basis of a Ginzburg-Landau theory. To examine the possible AFM-FFLO state in CeCoIn_5, we focus on the incommensurate AFM order characterized by the wave vector Q = Q_{0} \pm q_inc with Q_0 =(π,π,π) and q_inc \parallel [110] or [1-10] in the tetragonal crystal structure. We formulate the two component Ginzburg-Landau theory and investigate the two degenerate incommensurate AFM order. We show that the pinning of AFM moment due to the FFLO nodal planes leads to multiple phases in magnetic fields along [100] or [010]. The phase diagrams for various coupling constants between the two order parameters are shown for the comparison with CeCoIn_5. Experimental results of the NMR and neutron scattering measurements are 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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