LETTER TO THE EDITOR: Magnetic structure and the crystal field excitation in heavy-fermion antiferromagnetic superconductor CePt3Si
LETTER TO THE EDITOR: Magnetic structure and the crystal field excitation in heavy-fermion antiferromagnetic superconductor CePt3Si
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DOI：
10.1088/0953-8984/16/15/l01
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发表时间：
2004-04
期刊：
影响因子：
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通讯作者：
N. Metoki;K. Kaneko;T. Matsuda;A. Galatanu;T. Takeuchi;S. Hashimoto;T. Ueda;R. Settai;Y. Ōnuki;N. Bernhoeft
中科院分区：
文献类型：
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作者：
N. Metoki;K. Kaneko;T. Matsuda;A. Galatanu;T. Takeuchi;S. Hashimoto;T. Ueda;R. Settai;Y. Ōnuki;N. Bernhoeft
在TN = 2.2K和TSC = 0.75K下，对重费米子反铁磁（AFM）超导体CePt 3Si进行了中子散射实验.我们观察到清晰的AFM布拉格反射与Q 0 =（001/2）低于和高于TSC，表明AFM秩序和重费米子超导微观共存。原子力显微镜结构，两个交错的铁磁子晶格的本地Ce 4f的时刻，同时时空反转下具有反转对称性。然而，与Pt和Si的杂交打破了这种简并性，这两种竞争效应的组合可能与理解超导性和AFM顺序的同时发生有关。观测到的磁矩0.16（1）μB/Ce比居里-外斯有效磁矩2.54 μB/Ce大大降低。观察到在1和24毫电子伏的清晰的晶场激发。磁化率可以在假设Γ7基态、Γ6和Γ7第一和第二激发态的能级方案中得到很好的解释。
Neutron scattering experiments have been carried out on the heavy fermion antiferromagnetic (AFM) superconductor CePt3Si with TN = 2.2 K and TSC = 0.75 K. We observed clear AFM Bragg reflections with Q0 = (001/2) below and above TSC, indicating microscopic coexistence of AFM order and heavy fermion superconductivity. The AFM structure, of two interleaved ferromagnetic sublattices of local Ce 4f moments, has inversion symmetry under simultaneous space–time reversal. However, hybridization with Pt and Si breaks this degeneracy and a combination of these two competing effects may be relevant to an understanding of the simultaneous occurrence of superconductivity and AFM order. The observed magnetic moment 0.16(1) μB/Ce is strongly reduced from the Curie–Weiss effective moment 2.54 µB/Ce. Clear crystal field excitations at 1 and 24 meV were observed. The magnetic susceptibility can be well explained in a level scheme assuming the Γ7 ground state, Γ6 and Γ7 first and second excited states, respectively.