Magnetic anisotropy of Lu2CO17-xSix single crystals

作者：Tereshina E A^*; Andreev A V; Santava E; Danis S

来源：Acta Physica Polonica, A, 2008, 113(1): 235-238.

Magnetic anisotropy of Lu2CO17-xSix single crystals grown by the Czochralski method was investigated. The homogeneity range of Si substitution for Co extends up to x = 3.4 in Lu2CO17-xSix solid solutions. The unit cell volume, Curie temperature, and spontaneous magnetic moment decrease monotonously with increasing Si content. Lu2Co17 has the easyplane type of magnetic anisotropy in the ground state, which changes into the easy-axis type by two spin-reorientation transitions of the second-order, the easy-plane- easy-cone at T-SR1 similar to 680 K and the easy-cone - easy-axis at T-SR2 similar to 730 K. Upon Si substitution, the observed spin-reorientations shift towards the lower temperatures for Lu2CO17-xSix (T-SR1 similar to 75 K and T-SR2 similar to 130 K in Lu2Co16Si) and vanish for compounds with 1 < x <= 3.4, which have the uniaxial type of magnetic anisotropy in the whole temperature range of magnetic order.

• 出版日期2008-1