UNSPECIFIED. (1998) The first observation of dynamical chirality by means of polarized neutron scattering in the triangular lattice antiferromagnet CsMnBr3. JOURNAL OF PHYSICS-CONDENSED MATTER, 10 (5). pp. 951-960. ISSN 0953-8984

Abstract

The polarization-dependent part of the neutron scattering in the triangular-lattice antiferromagnet CsMnBr3 is studied. This scattering appears in an external magnetic field and is determined by the projection of a chiral fluctuation on the sample magnetization (the dynamical chirality, DC). It is shown that the DC cross section is an odd function of the energy transfer, omega, and is proportional to the magnetic field up to LO kOe above T-N. A Be filter is used instead of the analyser for measuring the DC scattering integrated over omega < 0. It is shown that below T-N the field dependence of this intensity reveals two features related to the acoustic spin waves and to a new type of low-energy magnetic excitation, presumably of topological nature. The temperature dependence of the acoustic spin waves near T-N is in qualitative agreement with dynamical scaling.

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