Field-Induced Phase Transitions in the S=1/2 Quasi-1D Antiferromagnet BaCo$_{2}$V$_{2}$O$_{8}$

We have performed magnetocaloric effect and specific heat measurements in the S=1/2 quasi-one-dimensional Ising-like antiferromagnet BaCo$_{2}$V$_{2}$O$_{8}$ in magnetic fields up to 24 T at temperatures down to 0.3 K. The magnetocaloric effect measurements were made in order to investigate the field-direction dependence of a magnetic transition near 3.7 T. The specific heat and magnetocaloric effect measurements were employed to determine the H-T phase diagram when the field is applied parallel to the $c$ axis of the sample. We have found a new antiferromagnetically ordered phase between 19.7 T and 23.1 T, most likely a spin-flop phase. At low fields, our results agree with the known N\'{e}el ordered phase boundary.