Impact of pressure on the magnetic order in an S=1/2 quantum antiferromagnet

ORAL

Abstract

Here we present a neutron scattering study on a spin-1/2 two-leg ladder antiferromagnet C9D18N2CuBr4 (DLCB for short) under applied hydrostatic pressure. In DLCB, the inter-ladder coupling is sufficiently strong to drive the system to the Néel antiferromagnetic ordering phase below TN=2 K and the analysis of the spin Hamiltonian reveals that DLCB is close to the quantum critical point in two dimensions at zero field and ambient pressure [1]. Single-crystal neutron diffraction measurements under pressures up to 1.3 Gpa suggest that size of the staggered moment becomes suppressed with increase of pressure and the magnetic order breaks down above pressure ~1.0 Gpa.

References:
[1] T. Hong et al., Phys. Rev. B 89, 174432 (2014); Nat. Phys. 13, 638 (2017).

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Presenters

  • Tao Hong

    Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Laboratory, Neutron Scattering Division, Oak-Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Lab

Authors

  • Tao Hong

    Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Laboratory, Neutron Scattering Division, Oak-Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Lab

  • Qing Huang

    Department of Physics and Astronomy, University of Tennessee, Department of Physics and Astronomy, The University of Tennessee, Knoxville, Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Sachith Dissanayake

    Department of Physics, Duke University, Oak Ridge National Laboratory, Duke University, Oak Ridge National Lab

  • Yiming Qiu

    National Institute of Standards and Technology, NIST Centre for Neutron Research, National Institute of Standards and Technology, Center for Neutron Research, National Institute of Standards and Technology, NIST Center for Neutron Research, National Institute of Standards and Technology

  • Yan Wu

    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory

  • Huibo Cao

    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory, Quantum Condensed Matter Division, Oak Ridge National Laboratory

  • Wei Tian

    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory

  • Haidong Zhou

    University of Tennessee, Department of Physics and Astronomy, University of Tennessee, University of Tennessee, Knoxville, Physics, University of Tennessee, Knoxville, TN, United States, Physics, University of Tennessee, Department of Physics and Astronomy, The University of Tennessee, Knoxville, Department of Physics and Astronomy, University of Tennessee, Knoxville, Department of Physics, University of Tennessee

  • Mark M. Turnbull

    Carlson School of Chemistry and Biochemistry, Clark University