Thermal expansion of the quasi two-dimensional magnetic layered compound BaNi2V2O8 under magnetic fields along c-axis

Abstract The quasi two-dimensional magnetic BaNi 2 V 2 O 8 is studied by using high-resolution thermal expansion in magnetic fields up to 10 T applied along the c -axis. A slight increase of about 1% of the three-dimensional antiferromagnetic ordering temperature T N is observed at 10 T. Positive and negative pressure dependencies of T N , respectively, are inferred from the thermal expansion α ( T ) for pressures applied along the a - and c -axes.