Effect of pressure on two-dimensional Heisenberg antiferromagnet Cu(HCOO)2.4H2O

The effect of pressure on two-dimensional Heisenberg antiferromagnet Cu(HCOO)2.4H2O has been investigated through X-ray diffraction, susceptibility and magnetization curve measurements. The pressurization induces the paramagnetic behavior above 1.4 kbar. The paramagnetic component increases continuously with increasing pressure, and the antiferromagnetic ordering and field-induced phase transition vanish above 2.8 kbar. The X-ray diffraction pattern at 6.6 kbar is not that of Cu(HCOO)2.4H2O but Cu(HCOO)2.2H2O. Therefore, the pressurization induces the crystal structural change from Cu(HCOO)2.4H2O to Cu(HCOO)2.2H2O with dehydration