Spin-gapped magnets with weak anisotropies II: Effects of exchange and Dzyaloshinsky-Moriya anisotropies on thermodynamic characteristics

30 Sep 2019  ·  Rakhimov Abdulla, Khudoyberdiev Asliddin, Tanatar Bilal ·

We study the modification of physical observables due to anisotropies in the framework of our mean-field based approach proposed previously. We have shown that, in contrast to exchange anisotropy (EA) interaction, the Dzyaloshinsky-Moriya (DM) interaction modifies the physics dramatically... Particularly, it changes the sign of the anomalous density to opposite in the whole range of temperatures and changes the shape of the specific heat. By using the experimental data on the magnetization of the compound TlCuCl$_3$, we have found optimal values for the strengths of EA and DM interactions. The spectrum of the energy of low lying excitations has also been studied and found to develop a linear dispersion similar to Goldstone mode with a negligibly small anisotropy gap. We come to the conclusion that to describe existing experimental data on magnetization as well as the energy spectrum of spin gapped quantum magnets with anisotropies simultaneously, one has to extend this approach, by choosing the vector of DM anisotropy appropriately. read more

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Statistical Mechanics Strongly Correlated Electrons