Single Crystal ESR Study of Y₂BaCuO₅

Abstract

Single-crystal ESR measurements were made in insulating Y 2 BaCuO 5 . The principal values of the g tensor of Cu 2+ ions in Y 2 BaCuO 5 are g X =2.050(4), g Y =2.094(4) and g Z =2.222(4), which reflects the rhombic symmetry. The principal X -axis is parallel to the crystallographic c -axis, the Y to the b , and the Z to the a . The crystal habits with Miller indices and the crystallographic axes are shown. The temperature dependence of the ratio of the ESR intensity to that of DPPH at room temperature, which agrees well with that observed for the magnetic susceptibility, is also reported.