Evolution of paramagnetic quasiparticle excitations emerged in the high-field superconducting phase of CeCoIn5.
Evolution of paramagnetic quasiparticle excitations emerged in the high-field superconducting phase of CeCoIn5.
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DOI：
10.1103/physrevlett.106.137004
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发表时间：
2011-03
影响因子：
8.6
通讯作者：
K. Kumagai;H. Shishido;T. Shibauchi;Y. Matsuda
中科院分区：
文献类型：
--
作者：
K. Kumagai;H. Shishido;T. Shibauchi;Y. Matsuda
我们在高磁场中对CeCoIn（5）的一种新的热力学相进行了（115）In NMR测量，其中存在具有无公度自旋密度波阶的奇异超导性。我们发现，在这个阶段的NMR谱提供了直接的证据，空间分布的正常准粒子区域的出现。对顺磁磁化强度和新出现的低能准粒子态密度的场演化的定量分析与以Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）态的序参量为特征的节面形成是一致的。核磁共振谱还表明，空间均匀的自旋密度波诱导的FFLO相。
We present (115)In NMR measurements in a novel thermodynamic phase of CeCoIn(5) in a high magnetic field, where exotic superconductivity exists with the incommensurate spin-density wave order. We show that the NMR spectra in this phase provide direct evidence for the emergence of the spatially distributed normal quasiparticle regions. The quantitative analysis for the field evolution of the paramagnetic magnetization and newly emerged low-energy quasiparticle density of states is consistent with the nodal plane formation, which is characterized by an order parameter in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. The NMR spectra also suggest that the spatially uniform spin-density wave is induced in the FFLO phase.