Neutron diffraction study of the heavy fermion superconductors UM2Al3(M=Pd, Ni)
Neutron diffraction study of the heavy fermion superconductors UM2Al3(M=Pd, Ni)
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重费米子超导体UM2Al3(M=Pd, Ni)的中子衍射研究
DOI：
10.1007/bf01313821
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
F. Steglich
中科院分区：
文献类型：
--
作者：
A. Krimmel;P. Fischer;B. Roessli;H. Maletta;C. Geibel;C. Schank;A. Grauel;A. Loidl;F. Steglich
对新的超导重费米子系统UPd2Al3和Uni2Al3进行了弹性中子散射研究。中子衍射谱明确地揭示了UPd2Al3的长程反铁磁有序，其有序磁矩μU=(0.85±0.0 3)μB，与超导态共存。这是迄今为止观测到的任何重费米子超导体中最大的μU值。对于UNi2Al3，在温度T≧1.5K没有观察到长程磁序，其有序矩的上限为0.2μB。
An elastic neutron scattering study was performed on the new superconducting heavy fermion systems UPd2Al3and UNi2Al3. The neutron diffraction patterns reveal unambiguously long range antiferromagnetic order in UPd2Al3with an ordered magnetic momentμU= (0.85±0.03)μB, which coexists with the superconducting state. This is by far the largestμUvalue observed for any heavy fermion superconductor. For UNi2Al3, no long-range magnetic order could be observed for temperaturesT≧1.5 K, yielding an upper limit of the ordered moment of 0.2μB.