k c e i v d 18 Sepiember 1992 Abslmel. Raman specm of he two-dimensional antiferromagnet hfnPSe3 are measured in the temperature region between 18 and 297 K. Below T, = 14 f 2 K an anomalous enhancement 01 some Raman-aaive phonon p b h observed. A new phonon peak appears below T, at I a n -I . me relation between its behaviour and Qe magnelic ordering is explained in terms of (lie spin-dependenl phonon Raman pmc?s. A peak at 133 a n -I (T = 18 K) shifts 10 low liequency with increasing Iemperature and disappeals above TN. I1 is assigned to a one-magnon Raman peak.

No abstract

No abstract