Magnetic resonance in new copper oxide Cu5Bi2B4O14 with triclinic symmetry

Abstract The frequency-field and angular dependencies of magnetic resonance in new copper oxide Cu 5 Bi 2 B 4 O 14 with triclinic symmetry are explored at T =4.2 K. It is established that the triclinic c -axis is the easy axis of magnetization. The considerable proportion of experimental data may be described using the orthorhombic magnetic symmetry of a crystal. Exception is made with angular dependency of resonant field in a plane of one of facets of a sample which reflects the triclinic symmetry of Cu 5 Bi 2 B 4 O 14 . From the resonant data the effective fields of magnetic crystallographic anisotropy are defined as H a x =20.1 kOe and H a y =8.1 kOe at T =4.2 K.