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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

  • 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

Authors

  • 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

  • Zhenzhong Shi

    Department of Physics, Duke University, Department of Physics, Duke University, Durham, North Carolina, USA, Dept. of Phys. & Natl. High Magnetic Field Lab., Florida State Univ., Duke University

  • Sachith Dissanayake

    Department of Physics, Duke University, Department of Physics, Duke University, Durham, North Carolina, USA, Physics, Duke University, Oak Ridge National Lab, Duke University, Oak Ridge National Laboratory

  • David E Graf

    Florida State University, National High Magnetic Field Laboratory, Florida State University, Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Lab, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory-Florida State University, National High Magnetic Field Laboratory, Tallahassee, FL, NHMFL, Florida State University, NHMFL

  • Philippe R. Corboz

    Universiteit van Amsterdam

  • Frederic Mila

    Institute of Physics, Ecole Polytechnique Federale de Lausanne, Ecole polytechnique federale de Lausanne

  • Daniel Silevitch

    Caltech, California Institute of Technology

  • Thomas F Rosenbaum

    California Institute of Technology, Caltech

  • Hanna Dabkowska

    McMaster University, Brockhouse Institute For Materials Research, McMaster University

  • Casey Marjerrison

    Department of Physics, Duke University, McMaster Univ, Duke University