标题： 73Ge-NMR/NQR对URhGe磁性性质的研究 显示英文标题

标题： 73Ge-NMR/NQR Investigation of Magnetic Properties of URhGe

摘要： 我们报告了铁磁超导体URhGe的73Ge-NMR和NQR结果。 内部场H_int的大小和方向以及Ge位点的电场梯度参数是通过实验确定的。 使用通过不同方法取向的粉末多晶样品，获得了磁场方向为H_0 // c（易轴）和H_0 // b时的NMR化学位移和核自旋弛豫率的场依赖性。 从H_0 // b的NMR化学位移，我们确认了居里温度的逐渐抑制，并在自旋再取向附近观察到了相分离。 相分离的观察提供了微观证据，表明在低温下H_0 // b下的自旋再取向是一阶的。 核自旋-晶格弛豫率1/T_1表明，当H_0 // c时磁涨落被抑制，而当H_0 // b时涨落仍然强烈。 对于H_0 // b，1/T_1T和核自旋-自旋弛豫率1/T_2的增强表明，URhGe中的场诱导超导性是在沿b轴和c轴的磁涨落下出现的。 显示英文摘要

摘要： We report 73Ge-NMR and NQR results for ferromagnetic (FM) superconductor URhGe. The magnitude and direction of the internal field, H_int, and parameters of the electric field gradient at the Ge site were determined experimentally. Using powdered polycrystalline samples oriented by different methods, the field dependences of NMR shift and nuclear spin relaxation rates for H_0 // c (easy axis) and H_0 // b were obtained. From the NMR shifts for H_0 // b, we confirmed a gradual suppression of the Curie temperature and observed a phase separation near the spin reorientation. The observation of the phase separation gives microscopic evidence that the spin reorientation under H_0 // b is of first order at low temperatures. The nuclear spin-lattice relaxation rate 1/T_1 indicates that the magnetic fluctuations are suppressed for H_0 // c, whereas the fluctuations remain strongly for H_0 // b. The enhancements of both 1/T_1T and the nuclear spin-spin relaxation rate 1/T_2 for H_0 // b toward the spin reorientation field suggest that the field-induced superconductivity in URhGe emerges under the magnetic fluctuations along the b axis and the c axis.