MAGNETIC-PROPERTIES OF BASIC COPPER(II) FORMATES

Cu(HCOO)(OH) exhibits a strong ferromagnetic interaction (theta =+43K) . The susceptibility shows a sharp maximum at T-m=21K and a plateau be low 12K. This magnetic behavior is characteristic of antiferromagnetic materials. The spin-flop behavior is observed below T-m. To examine t he spin-flop behavior of Cu(HCOO)(OH), magnetic phase diagram was draw n up. Magnetic phase diagram of Cu(DCOO)(OD) was also constructed to e xamine whether magnetic interaction between layers is due to hydrogen bond or not. Between them there is little difference in the phase diag ram, but there is a remarkable difference in the hysteresis curves at 2K. Besides, temperature dependence of susceptibility and hysteresis c urve at 1.8K of Cu-3(HCOO)(2)(OH)(4) was measured. In consequence it w as found that this material also showed spin-flop behavior.