Muon spin rotation and relaxation in Pr1-xNdxOs4Sb12: magnetic and superconducting ground states
Muon spin rotation and relaxation in Pr1-xNdxOs4Sb12: magnetic and superconducting ground states
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Pr1-xNdxOs4Sb12 中的 μ 子自旋旋转和弛豫：磁性和超导基态
DOI：
10.1103/physrevb.89.144419
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and R. H. Fukuda
中科院分区：
文献类型：
--
作者：
D. E. MacLaughlin;P.-C. Ho;L. Shu;O. O. Bernal;S. Zhao;A. A. Dougraghi;T. Yanagisawa;M. B. Maple;and R. H. Fukuda
利用μ子自旋旋转和弛豫实验研究了该系列合金的磁性和超导基态。在铁磁末端化合物中，在有序温度以下正μ子（）位置的自发局域场大于偶极耦合到铁磁排列的Nd磁矩的预期，表明额外的间接RKKY类转移超精细机制。零场和弱纵向场的自旋弛豫率表明，下面的静态场是约化的和强无序的。我们认为，这是不可能的，是由于减少的Ndmoments，并推测Nd相互作用被抑制和无序的Pr掺杂。在一个超导温度低于K的样品中，在低于25 mK的温度下，没有“自旋冻结”（静态Nd磁性）的迹象，无论是有序的还是无序的。动力学自旋弛豫是强的，表明显着的钕力矩波动。超导涡旋晶格相的反磁频移和自旋弛豫在下面缓慢下降，表明Nd自旋涨落对费米液体重整化的破坏和/或可能的修改。因为，SR数据提供了反对相分离的证据;超导性和Nd磁性在原子尺度上共存。
Muon spin rotation and relaxation (SR) experiments have been carried out to characterize magnetic and superconducting ground states in thealloy series. In the ferromagnetic end compoundthe spontaneous local field at positive-muon () sites below the ordering temperatureis greater than expected from dipolar coupling to ferromagnetically aligned Ndmoments, indicating an additional indirect RKKY-like transferred hyperfine mechanism. For,spin relaxation rates in zero and weak longitudinal applied fields indicate that static fields atsites beloware reduced and strongly disordered. We argue this is unlikely to be due to reduction of Ndmoments, and speculate that the Nd-interaction is suppressed and disordered by Pr doping. In ansample, which is superconducting belowK, there is no sign of “spin freezing” (static Ndmagnetism), ordered or disordered, down to 25 mK. Dynamicspin relaxation is strong, indicating significant Nd-moment fluctuations. Thediamagnetic frequency shift and spin relaxation in the superconducting vortex-lattice phase decrease slowly below, suggesting pair breaking and/or possible modification of Fermi-liquid renormalization by Nd spin fluctuations. For, theSR data provide evidence against phase separation; superconductivity and Ndmagnetism coexist on the atomic scale.