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Spin triangle chain with ferromagnetic and antiferromagnetic interactions on the transition line
- Source :
- Journal of Physics: Condensed Matter, 35(9), 095802 (2023)
- Publication Year :
- 2022
-
Abstract
- We investigate spin-$\frac{1}{2}$ anisotropic model of a linear chain of triangles with competing ferro- and antiferromagnetic interactions and ferromagneic Heisenberg interactions between triangles. For a certain ratio between interactions the one-magnon excitation band is dispersionless leading to an existence of localized-magnon states which form macroscopically degenerated ground states. The spectrum of excitations has a specific structure depending on the value of the triangle-triangle interaction. Such specific structure determines the low-temperature thermodynamics and, in particular, the temperature dependence of a specific heat. In the limit of strong anisotropy of interactions the spectrum has a multi-scale structure which consists of subsets rank-ordered on small parameter. Each subset is responsible for the appearance of the peak in the temperature dependence of the specific heat.<br />Comment: 23 pages, 13 figures
Details
- Database :
- arXiv
- Journal :
- Journal of Physics: Condensed Matter, 35(9), 095802 (2023)
- Publication Type :
- Report
- Accession number :
- edsarx.2209.14459
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1088/1361-648X/acad55