Field dependence of the ground state in the exotic superconductor CeCoIn5: a nuclear magnetic resonance investigation.
Field dependence of the ground state in the exotic superconductor CeCoIn5: a nuclear magnetic resonance investigation.
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奇异超导体 CeCoIn5 中基态的场依赖性：核磁共振研究。
DOI：
10.1103/physrevlett.101.047004
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发表时间：
2008
影响因子：
8.6
通讯作者：
J. Flouquet
中科院分区：
文献类型：
--
作者：
G. Koutroulakis;V. Mitrović;M. Horvatić;C. Berthier;G. Lapertot;J. Flouquet
我们报告了低温（T约70 mK）下CeCoIn 5中的115 In核磁共振（NMR）测量结果，该测量结果是垂直于c轴施加的2至13.5 T磁场（H0）的函数。NMR谱线位移表明，在10 T以下，自旋磁化率随sqrt[H0]增加。我们将这与由于塞曼和多普勒频移准粒子扩展到d波超导体的涡核之外的状态密度的增加相关联。在10 T以上，一个新的超导态被稳定下来，可能是富尔德、费雷尔、拉金和奥夫钦尼科夫预测的调制相位。这个阶段是清楚地确定了一个强大的和线性增加的NMR位移与字段，在一阶跃过渡到正常状态之前。
We report 115In nuclear magnetic resonance (NMR) measurements in CeCoIn5 at low temperature (T approximately 70 mK) as a function of the magnetic field (H0) from 2 to 13.5 T applied perpendicular to the c axis. A NMR line shift reveals that below 10 T the spin susceptibility increases as sqrt[H0]. We associate this with an increase of the density of states due to the Zeeman and Doppler-shifted quasiparticles extended outside the vortex cores in a d-wave superconductor. Above 10 T a new superconducting state is stabilized, possibly the modulated phase predicted by Fulde, Ferrell, Larkin, and Ovchinnikov. This phase is clearly identified by a strong and linear increase of the NMR shift with the field, before a jump at the first order transition to the normal state.
影响因子：
8.6
作者：
Lortz, R.;Wang, Y.;Wosnitza, J.
通讯作者：
Wosnitza, J.