The NMR measurements performed on a single orthorhombic crystal of superconducting ferromagnet UCoGe [Y. Ihara et al., Phys. Rev. Lett. 105, 206403 (2010)] demonstrate strongly anisotropic magnetic properties of this material. The presented calculations allow one to establish the dependence of longitudinal spin-lattice relaxation rate from temperature and magnetic field. The value $(1/T_{1}T)$ in field perpendicular to spontaneous magnetization directed along the $c$ axis has a maximum in the vicinity of Curie temperature, whereas it does not reveal similar behavior in a field parallel to the direction of spontaneous magnetization. Also there was shown that the longitudinal spin-lattice relaxation rate is strongly field dependent when the field directed in the $b$-crystallographic direction but field independent if magnetic field is oriented along the $a$ axis.

中文翻译：

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UCoGe 中的核自旋晶格弛豫时间

NMR 测量是在超导铁磁体 UCoGe [Y. 伊原等人。，物理。牧师莱特。 105 , 206403 (2010)] 证明了这种材料的强各向异性磁性。所提出的计算允许人们建立纵向自旋晶格弛豫率与温度和磁场的相关性。价值$(1/{吨}_1吨)$ 在垂直于自发磁化强度的场中 $C$轴在居里温度附近具有最大值，而在平行于自发磁化方向的场中没有表现出类似的行为。还表明，当场指向$乙$- 如果磁场沿晶体方向取向但与场无关 $\mathrm{一种}$ 轴。