B-T phase diagram of CoCr2O4 in magnetic fields up to 14 T
  We have measured the magnetization and specific heat of multiferroic CoCr2O4 in magnetic fields up to 14 T. The high-field magnetization measurements indicate a new phase transition at T* = 5 - 6 K. The phase between T* and the lock-in transition at 15 K is characterized by magnetic irreversibility. At higher magnetic fields, the irreversibility increases. Specific-heat measurements confirm the transition at T*, and also show irreversible behavior. We construct a field-temperature phase diagram of CoCr2O4. 
A. V. Pronin, M. Uhlarz, R. Beyer, T. Fischer, J. Wosnitza, B. P.   Gorshunov, G. A. Komandin, A. S. Prokhorov, M. Dressel, ...
cond-mat.mtrl-sci cond-mat.str-el