Fractional magnetization plateaux of a spin-1/2 Heisenberg model on the Shastry-Sutherland lattice: effect of quantum XY interdimer coupling
T. Verkholyak, J. Strecka
SciPost Phys. 12, 056 (2022) · published 9 February 2022
- doi: 10.21468/SciPostPhys.12.2.056
- Submissions/Reports
Abstract
Spin-1/2 Heisenberg model on the Shastry-Sutherland lattice is considered within the many-body perturbation theory developed from the exactly solved spin-1/2 Ising-Heisenberg model with the Heisenberg intradimer and Ising interdimer interactions. The former model is widely used for a description of magnetic properties of the layered compound SrCu$_2$(BO$_3$)$_2$, which exhibits a series of fractional magnetization plateaux at sufficiently low temperatures. Using the novel type of many-body perturbation theory we have found the effective model of interacting triplet excitations with the extended hard-core repulsion, which accurately recovers 1/8, 1/6 and 1/4 magnetization plateaux for moderate values of the interdimer coupling. A possible existence of a striking quantum phase of bound triplons is also revealed at low enough magnetic fields.
Cited by 5
Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- 1 National Academy of Sciences of Ukraine [Національна академія наук України]
- 2 University of P. J. Shafarik
- Agentúra na Podporu Výskumu a Vývoja (through Organization: Agentúra na podporu výskumu a vývoja / Slovak Research and Development Agency [APVV])
- Ministerstvo školstva, vedy, výskumu a športu Slovenskej republiky (through Organization: Agentúra Ministerstva školstva, vedy, výskumu a športu SR / Ministry of Education, Science, Research and Sport of the Slovak Republic)