μ+ SR studies of UM2Al3, M=Ni, Pd

μ+ SR studies of UM2Al3, M=Ni, Pd
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UM2Al3、M=Ni、Pd 的 μ+ SR 研究

DOI:
10.1007/bf01313820
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发表时间:
1992
期刊:
影响因子:
--
通讯作者:
M. Weber
M. Weber
中科院分区:
--
文献类型:
--
作者:
A. Amato;C. Geibel;F. Gygax;R. Heffner;E. Knetsch;D. MacLaughlin;C. Schank;A. Schenck;F. Steglich;M. Weber

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在新的重费米子超导体UM2Al3、M=Ni和Pd中进行了正介子自旋(μ+SR)测量。在uni2al3中,在零场下观察到的μ+频率表明U矩的反铁磁有序(AF) ~ 0.1μB/U原子。这些力矩与超导性共存,并且在AF重费米子超导体中具有观测到的最高值。在upd2al3的AF状态下,零场μ+SR中没有明确的频率,表明存在对称的μ+停止点。在该系统中,μ+SR线宽低于产量,伦敦穿透深度的初步值为~ 8000 Å。
Positive-muon spin rotation (μ+SR) measurements have been carried out in the new heavy-fermion superconductors UM2Al3, M=Ni and Pd. In UNi2Al3the observedμ+frequencies in zero applied field indicate commensurate antiferromagnetic (AF) ordering of U moments ∼0.1μB/U atom. These moments coexist with superconductivity and have the highest values observed in an AF heavy-fermion superconductor. The absence of well-defined frequencies in zero-fieldμ+SR in the AF state of UPd2Al3suggests symmetricμ+stopping sites. In this systemμ+SR linewidths belowTcyield a preliminary value of ∼8000 Å for the London penetration depth.