Fractional magnetization plateaux of a spin-1/2 Heisenberg model on the Shastry-Sutherland lattice: effect of quantum XY interdimer coupling
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...
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| Format: | Article |
| Language: | English |
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SciPost
2022-02-01
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| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.12.2.056 |
| Summary: | 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. |
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| ISSN: | 2542-4653 |