Magnetic phase diagram copper metaborate CuB_2O_4 in magnetic field   parallel c-axis: resonant, magnetic and magnetoelastic investigations
  The magnetic phase diagram in a single crystal of copper metaborate CuB_2O_4 in a magnetic field parallel to a tetragonal axis $c$ has been investigated.   From the resonant, magnetic and magnetostrictive data the phase diagram of CuB_2O_4 on a plane ``temperature - magnetic field'' is constructed. The magnetic incommensurate-commensurate phase transition is caused by the saturation of weak subsystem of copper ions in the strong magnetic field $H\|c$. 
A. Pankrats, G. Petrakovskii, V. Tugarinov, K. Sablina, L.   Bezmaternykh, L. Szymczak, M. Baran, B. Kundys, A. Nabialek