Single ferromagnetic fluctuations in UCoGe revealed by 73Ge- and 59Co-NMR studies
Single ferromagnetic fluctuations in UCoGe revealed by 73Ge- and 59Co-NMR studies
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73Ge 和 59Co-NMR 研究揭示了 UCoGe 中的单一铁磁涨落
DOI：
10.1103/physrevb.97.075130
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
and Dai Aoki
中科院分区：
文献类型：
--
作者：
Masahiro Manago;Kenji Ishida;and Dai Aoki
用核磁共振（NMR）和核四极共振（NQR）对顺磁状态下富a的铁磁超导体UCoGe单晶样品进行了测量。由NQR和NMR推导出的NQR参数与另一种同结构铁磁超导体URhGe的参数接近。当磁场平行于理论轴时，Ge和Co位的奈特位移彼此之间的比例很好。估计Ge的超细耦合常数与Co的超细耦合常数接近。两轴间自旋磁化率的巨大差异可能导致平行于这两个方向的电场对超导性和铁磁性的不同响应。在5k以上，两个位置的核自旋-晶格弛豫速率的温度依赖性是相似的。这些结果表明，这种化合物的铁磁性是由流动的u电子引起的，这与以往的研究结果一致。讨论了这三种铁磁超导体的异同。
andnuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements have been performed on a-enriched single-crystalline sample of the ferromagnetic superconductor UCoGe in the paramagnetic state. TheNQR parameters deduced from NQR and NMR are close to those of another isostructural ferromagnetic superconductor URhGe. The Knight shifts of the Ge and Co sites are well scaled to each other when the magnetic field is parallel to theoraxis. The hyperfine coupling constants of Ge are estimated to be close to those of Co. The large difference of spin susceptibilities between theandaxes could lead to the different response of the superconductivity and ferromagnetism with the field parallel to these directions. The temperature dependence of the nuclear spin-lattice relaxation ratesat the two sites is similar to each other above 5 K. These results indicate that the itinerant U-electrons are responsible for the ferromagnetism in this compound, consistent with previous studies. The similarities and differences in the three ferromagnetic superconductors are discussed.