Magnetic phases in the S=1 Shastry-Sutherland model with uniaxial anisotropy
| Autor: | Pinaki Sengupta, Keola Wierschem, Lei Su |
|---|---|
| Přispěvatelé: | School of Physical and Mathematical Sciences |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Physics
Spins Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) FOS: Physical sciences Science::Physics [DRNTU] Condensed Matter Physics Electronic Optical and Magnetic Materials Paramagnetism symbols.namesake Theoretical physics Supersolid Condensed Matter - Strongly Correlated Electrons symbols Ising model Condensed Matter::Strongly Correlated Electrons Ground state Anisotropy Hamiltonian (quantum mechanics) Quantum fluctuation |
| Popis: | We explore the field induced magnetic phases of an $S=1$ $XXZ$ model with single-ion anisotropy and large Ising-like anisotropy on a Shastry Sutherland lattice over a wide range of Hamiltonian parameters and applied magnetic field. The multitude of ground state phases are characterized in detail in terms of their thermodynamic properties and the underlying classical (Ising limit) spin arrangements for the plateau phases are identified by calculating the static structure factors. The enlarged local Hilbert space of the $S=1$ spins results in several new ground state phases that are not realized for $S=1/2$ spins. These include the quantum paramagnetic state that is ubiquitous to $S=1$ spins with single ion anisotropy, two different spin supersolid phases (with distinct longitudinal ordering) and a magnetization plateau that arises as a direct descendant of the 1/3 plateau due to quantum fluctuations that are not possible for $S=1/2$ spins. We predict the same mechanism will lead to plateaus at smaller fractions of 1/3 for higher spins. The full momentum dependence of the longitudinal and transverse components of the static structure factor is calculated in the spin supersolid phase to demonstrate the simultaneous existence of diagonal and off-diagonal long-range order as well as the different longitudinal orderings. Comment: 7 pages, 7 figures |
| Databáze: | OpenAIRE |
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