Neutron Scattering Study on High-quality Single Crystals of Non-Centrosymmetric Heavy-Fermion Superconductor CePt3Si
Neutron Scattering Study on High-quality Single Crystals of Non-Centrosymmetric Heavy-Fermion Superconductor CePt3Si
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DOI：
10.1143/jpsjs.81sb.sb006
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发表时间：
2012-12
影响因子：
1.7
通讯作者：
K. Kaneko;O. Stockert;M. Skoulatos;A. Schneidewind;T. Takeuchi;T. Matsuda;Y. Haga;R. Settai;Y. Ōnuki;N. Metoki
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文献类型：
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作者：
K. Kaneko;O. Stockert;M. Skoulatos;A. Schneidewind;T. Takeuchi;T. Matsuda;Y. Haga;R. Settai;Y. Ōnuki;N. Metoki
为了深入了解磁性及其与超导性的关系，对非中心对称重费米子超导体CePt 3Si（TN = 2.2K，Tsc = 0.45K）的高质量单晶进行了中子散射实验.本研究中使用的所有样品均通过比热测量进行表征。所有样品在Tc =0.45 K和TN =2.2 K处的比热跃变证明了晶体的高质量.中子衍射研究证实，在超导态内部存在一个反铁磁峰，其传播矢量q =（0，0，1/2），在Tc以下磁场强度受到微小的抑制.相反，外部磁场沿着[001]方向引起反铁磁状态的急剧变化，反铁磁强度随外加磁场的增加而显著增强。磁场强度在B c2处无异常，而在arc处有一个小的拐点。
In order to get detailed insights into magnetism and its relationship with superconductivity, neutron scattering experiments were carried out on high-quality single crystals of the non-centrosymmetric heavy-fermion superconductor CePt 3 Si, with T N =2.2 K and T sc ∼0.45 K. All the samples used in this study were characterised via specific heat measurements. Sharp specific heat jumps at T sc =0.45 K, and T N =2.2 K for all samples prove the high quality of the crystal.The neutron diffraction study confirms that an antiferromagnetic peak described with the propagation vector q =(0,0,1/2) persists inside the superconducting state, with a tiny suppression of the magnetic intensity below T sc . In contrast, an external magnetic field along the [001] direction causes a drastic change in the antiferromagnetic state; the antiferromagnetic intensity shows an enormous enhancement with increasing applied field. The magnetic intensity does not show any anomaly at B c2 , instead there exists a small inflection at aro...