Study of the FFLO State and the Anomalous Magnetic Order in CeCoIn5

CeCoIn5中FFLO状态和反常磁序的研究

• 批准号: 23540398
• 负责人: KUMAGAI KEN-ICHI
• 金额: $ 3.24万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23540398/
• 关键词: 強相関系; 超伝導; 磁気秩序; NMR; 強相関電子系; 核磁気共鳴; CeCoIn5; 強相関電子

To improve our understanding of how the exotic superconductivity and magnetism can interact in CeCoIn5, we measured 115In NMR and demonstrate the emergence of a spatially distributed normal quasiparticle region in the HL-phase in parallel field. The field evolution of the paramagnetic magnetization and low energy quasiparticle DOS can be described well by the order parameter associated with the nodal plane formation via the FFLO second order phase transition. The evolution of NMR spectra with respect to angle between external field and a-axis reveasl that the magnetic structure changes from the spatially-uniform to the spatially-modulated one. The exotic FFLO phase is suppressed with increasing the angle, and disappears for beyond 20 degree.Our results provide strong evidence for the formation of the FFLO state via the second order phase transition and coexistence ot the static magnetic order and FFLO state.

为了提高我们对cecoin5中外来的超导性和磁性如何相互作用的理解，我们测量了115in NMR，并证明了平行场中HL-phase中空间分布的正常准粒子区域的出现。顺磁磁化和低能量准粒子DO的场演化可以通过与淋巴结平面形成相关的顺序参数通过FFLO二阶相变。 NMR光谱相对于外场和A轴之间的角度的演变，即磁结构从空间均匀变为空间调节的磁结构。外来的FFLO相通过增加角度抑制，并且在20度以上消失。您的结果为FFLO态通过二阶相变形成的结果提供了有力的证据，并与静态磁性和FFLO状态共存。

项目成果

Spatially-Modulated Superconducting Gap in CeCoIn5

CeCoIn5 中的空间调制超导能隙

• 发表时间: 2012
• 作者: K. Kumagai;H. Shishido;T. Shibauchi and Y. Matsuda
• 通讯作者: T. Shibauchi and Y. Matsuda

NMR Study of Magnetic Order and the FFLO state in CeCoIn5

CeCoIn5 中磁序和 FFLO 态的 NMR 研究

• 发表时间: 2012
• 作者: K. Kumagai;H. Shishido;T. Shibauchi and Y. Matsuda
• 通讯作者: T. Shibauchi and Y. Matsuda

Field Evolution of the FFLO State and Magnetism in CeCoIn5

CeCoIn5 中 FFLO 状态和磁性的场演化

• 发表时间: 2011
• 作者: K. Kumagai;H. Shishido;T. Shibauchi and Y. Matsuda
• 通讯作者: T. Shibauchi and Y. Matsuda

NMR Study of Magnetic Order and Spatially-Modulated Superconducting Gap in CeCoIn5

CeCoIn5 中磁序和空间调制超导能隙的核磁共振研究

• 发表时间: 2012
• 作者: K. Kumagai;H. Shishido;T. Shibauchi and Y. Matsuda
• 通讯作者: T. Shibauchi and Y. Matsuda

NMR Study of the Magnetic Order in the FFLO State of CeCoIn5

CeCoIn5 FFLO 态磁序的核磁共振研究

• 发表时间: 2013
• 作者: K. Kumagai;H. Shishido;T. Shibauchi and Y. Matsuda
• 通讯作者: T. Shibauchi and Y. Matsuda