Quantum Phases Diagram of the Plaquette State of the Shastry-Sutherland Compound SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</sub>
ORAL
Abstract
The Shastry-Sutherland compound SrCu2(BO3)2 features 2D layers of Cu2+ S=1/2 spin dimers which are orthogonal to each other. The ground state of the system is determined by the relative strength of the nearest neighbor and next-nearest neighbor interactions, J and J’ respectively. The ratio of J/J’ can be tuned continuously by application of hydrostatic pressure. The ground state changes from a spin dimer singlet state at ambient pressure to an antiferromagnet state at high pressure. At intermediate pressure a novel 4-spin plaquette singlet state has recently been reported. However, the nature of this plaquette state and how it evolves into other phases remains unclear. Here, we report a comprehensive study of the quantum phase diagram of the plaquette state by tuning temperature, pressure, magnetic field, and chemical doping. We mapped out the evolution of the ground states using complementary techniques such as magnetic susceptibility, magnetization and neutron scattering measurements. The results provide insights into the nature of the plaquette state, and also has implications in areas such as studies of deconfined quantum criticality.
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Presenters
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Sara Haravifard
- Department of Physics and Department of Mechanical Engineering & Materials Science, Duke University
- Department of Physics and Department of Mechanical Engineering & Materials Science, Duke University, North Carolina, USA
- Department of Physics, Department of Mechanical Engineering & Materials Science, Duke University
- Duke University