NEW RESULTS ON THE MAGNETIC PHASES OF CSCUCL3 IN THE EXTERNAL-FIELD

We report on specific heat, magnetisation and neutron diffraction resu lts for the hexagonal, magnetically frustrated system CsCuCl3. In an e xternal field orthogonal to the c-axis, above 5 Tesla, an abrupt trans ition to a new magnetic phase is found, clearly in the specific heat, less clearly in the magnetisation. The available field up to 6 Tesla f or the neutron experiments proved not high enough to extract the struc ture of this phase. The Neel temperature rises in the field and the co ntinuous transition to the paramagnetic phase seems to be of an unusua l nature. (C) 1997 Elsevier Science Ltd.