EFFECTS OF BIQUADRATIC INTERACTIONS ON THE MAGNETIZATION PROCESS OF CSMNCL3.2H2O

Effects of biquadratic exchange interactions on the magnetization proc ess of an antiferromagnetic classical-spin chain are theoretically stu died in connection with experimental results of CsMnCl3.2H2O. The inte ractions being relatively weak have significant influence on the trans ition from the spin-flopped state to the ferromagnetic state, which ex plains the characteristic feature of the saturation behavior of the ma gnetization process observed in CsMnCl3.2H2O. In addition, the paramet er values we determine reproduce reasonably well the susceptibility an d the spin wave spectrum observed at zero field.