PRESSURE DEPENDENCE OF THE ORDERING TEMPERATURE OF THE QUASI TWO-DIMENSIONAL FERROMAGNET (CH3NH3)2CuCl4.

From magnetic susceptibility measurements, the ordering temperature T//C of ferromagnetic (CH//3NH//3)//2CuCl//4 was determined as a function of hydrostatic pressure up to P approximately equals 11 kbar. The increase of T//C, approximately equals 30% for approximately equals 11 kbar, is roughly quadratic with P. The data are discussed in terms of the P-dependence of the effective interlayer exchange field H//E prime .