Collective Excitations in the Frustrated Classical Spin Liquid MgCr<sub>2</sub>O<sub>4</sub>

Bulletin of the American Physical Society

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APS March Meeting 2018

Volume 63, Number 1

Monday–Friday, March 5–9, 2018; Los Angeles, California

Session H23: Excitations in Magnetic Oxides (Bulk)

2:30 PM–5:30 PM, Tuesday, March 6, 2018
LACC Room: 402B

Sponsoring Units: GMAG DMP DCOMP
Chair: Huibo Cao, Oak Ridge National Lab

Abstract ID: BAPS.2018.MAR.H23.2

Abstract: H23.00002 : Collective Excitations in the Frustrated Classical Spin Liquid MgCr₂O₄

2:42 PM–2:54 PM

Abstract

Presenter:

XIAOJIAN BAI
(Physics, Georgia Inst of Tech)

Authors:

XIAOJIAN BAI
(Physics, Georgia Inst of Tech)

Eliot Kapit
(Department of Physics & Engineering Physics, Tulane University)

Joseph Paddison
(University of Cambridge)

Jiajia Wen
(Stanford University)

Seyed Koohpayeh
(Johns Hopkins University)

Garrett Granroth
(Oak Ridge National Laboratory)

Alexander Kolesnikov
(Oak Ridge National Laboratory)

Tyrel McQueen
(Johns Hopkins University)

John Chalker
(Oxford University)

Collin Broholm
(Johns Hopkins University)

Martin Mourigal
(Physics, Georgia Inst of Tech)

Frustrated magnetic materials are of fundamental interest because they show exotic properties that arise from competing constraints; e.g., suppression of conventional magnetic order and sensitivity of the ground state to perturbations. The spinel MgCr₂O₄ is a canonical example of a highly-frustrated antiferromagnet in which Heisenberg spins occupy a pyrochlore lattice of corner-sharing tetrahedra. Magnetic frustration is demonstrated by the suppression of the magnetic ordering temperature compared to the Weiss constant and broad magnetic excitations resembling emergent hexagonal spin-loops. We present a comprehensive single crystal inelastic neutron scattering study of this material in the spin liquid regime based on a classical Heisenberg model. The dynamical structure factor is simulated in the framework of spin-wave theory and shows excellent agreement with the experimental data.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.H23.2

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Bulletin of the American Physical Society

APS March Meeting 2018

Volume 63, Number 1

Monday–Friday, March 5–9, 2018; Los Angeles, California

Session H23: Excitations in Magnetic Oxides (Bulk)

Abstract: H23.00002 : Collective Excitations in the Frustrated Classical Spin Liquid MgCr2O4

Presenter:

Authors:

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Abstract: H23.00002 : Collective Excitations in the Frustrated Classical Spin Liquid MgCr₂O₄