Incommensurate magnetic structure in copper metaborate

Abstract The results on the magnetic susceptibility, magnetization, specific heat, neutron scattering and μSR of the tetragonal copper metaborate single crystal are presented. The commensurate easy-plane weak-ferromagnetic structure was determined in the temperature range 21– 10 K . The incommensurate magnetic ground state of this crystal was observed at the temperatures below 10 K until 0.15 K . The high external magnetic field induced the phase transition from the incommensurate to commensurate structure.