LOW-TEMPERATURE MAGNETIC PHASE OF KMNFEF6 - A NEUTRON DEPOLARIZATION AND DIFFRACTION STUDY

Neutron diffraction and zero-field-cooled, field-cooled neutron depola risation measurements have been carried out for KMnFeF6 system. Our st udy does not indicate any feature of spin-glass like transition near 1 08 K as reported in the literature. On the other hand, results show th e presence of long range ferrimagnetic correlation in this geometrical ly frustrated system. The observed features of a.c. susceptibility, lo w-field magnetisation and neutron depolarisation measurements have bee n explained on the basis of thermally activated domain wall movement o f ferrimagnetic arrangement of canted spins. Copyright (C) 1996 Elsevi er Science Ltd