arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1104.2672cond-mat.supr-concond-mat.str-el
收藏

反铁磁Fulde-Ferrell-Larkin-Ovchinnikov态的磁结构

Magnetic structure of antiferromagnetic Fulde-Ferrell-Larkin-Ovchinnikov state

Youichi Yanase, Manfred Sigrist

摘要:

通过求解Bogoliubov-de-Gennes(BdG)方程,研究了Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)态的无公度反铁磁(AFM)序的性质.阐明了电子结构和磁结构之间的关系。我们发现AFM-FFLO态的磁结构包括三种情况。(I)在强局域化的情况下,原子力显微镜交错矩被限制在超导序参量消失的FFLO节平面内。(II)在弱局域情况下,AFM交错矩出现在整个空间区域,其大小在FFLO节面附近增强。(III)在扩展的情况下,AFM交错的时刻是几乎均匀的,并略有抑制在附近的FFLO节面。在每种情况下的布拉格峰的结构的动量分辨结构因子进行了研究。通过与中子散射数据的比较,讨论了重费米子超导体CeCoIn_5中AFM-FFLO态的可能性。实验上CeCoIn_5高场超导相的磁结构及其对磁场取向的依赖性与情形(II)一致。

英文摘要:

The properties of incommensurate antiferromagnetic (AFM) order in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is studied by solving the Bogoliubov-de-Gennes (BdG) equations. The relationship between the electronic structure and the magnetic structure is clarified. We find that the magnetic structure in the AFM-FFLO state includes three cases. (I) In the strongly localized case, the AFM staggered moment is confined into the FFLO nodal planes where the superconducting order parameter vanishes. (II) In the weakly localized case, the AFM staggered moment appears in the whole spatial region, and its magnitude is enhanced around the FFLO nodal planes. (III) In the extended case, the AFM staggered moment is nearly homogeneous and slightly suppressed in the vicinity of FFLO nodal planes. The structure of Bragg peaks in the momentum resolved structure factor is studied in each case. We discuss the possibility of AFM-FFLO state in the heavy fermion superconductor CeCoIn_5 by comparing these results with the neutron scattering data. Experimentally the magnetic structure and its dependence on the magnetic field orientation in the high field superconducting phase of CeCoIn_5 are consistent with the case (II).

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。

↑