Magnetic Excitations of the Classical Spin Liquid MgCr 2 O 4

Bai, X.; Paddison, J.  A. M.; Kapit, E.; Koohpayeh, S.  M.; Wen, J. -J.; Dutton, S.  E.; Savici, A.  T.; Kolesnikov, A.  I.; Granroth, G.  E.; Broholm, C.  L.; Chalker, J.  T.; Mourigal, M.

doi:10.1103/physrevlett.122.097201

Title: Magnetic Excitations of the Classical Spin Liquid ${MgCr}_{2} O_{4}$

Journal Article · Tue Mar 05 00:00:00 EST 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.122.097201· OSTI ID:1658379

Bai, X. ^[1]; Paddison, J. A. M. ^[2]; Kapit, E. ^[3]; Koohpayeh, S. M. ^[4]; Wen, J. -J. ^[4]; Dutton, S. E. ^[5]; Savici, A. T. ^[6]; Kolesnikov, A. I. ^[6]; Granroth, G. E. ^[6]; Broholm, C. L. ^[7]; Chalker, J. T. ^[8]; Mourigal, M. ^[9]

Georgia Inst. of Technology, Atlanta, GA (United States)
Georgia Inst. of Technology, Atlanta, GA (United States); Univ. of Cambridge (United Kingdom). Churchill College
Univ. of Oxford (United Kingdom). Rudolf Peierls Centre for Theoretical Physics; Colorado School of Mines, Golden, CO (United States)
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter and Department of Physics and Astronomy
Princeton Univ., NJ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter and Department of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Oxford (United Kingdom). Rudolf Peierls Centre for Theoretical Physics
Georgia Inst. of Technology, Atlanta, GA (United States); Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter and Department of Physics and Astronomy

We report a comprehensive inelastic neutron-scattering study of the frustrated pyrochlore antiferromagnet MgCr2O4 in its cooperative paramagnetic regime. Theoretical modeling yields a microscopic Heisenberg model with exchange interactions up to third-nearest neighbors, which quantitatively explains all of the details of the dynamic magnetic response. Our work demonstrates that the magnetic excitations in paramagnetic MgCr2O4 are faithfully represented in the entire Brillouin zone by a theory of magnons propagating in a highly correlated paramagnetic background. Our results also suggest that MgCr2O4 is proximate to a spiral spin-liquid phase distinct from the Coulomb phase, which has implications for the magnetostructural phase transition in MgCr2O4.

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Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); Gordon and Betty Moore Foundation (GBMF)

Grant/Contract Number:: SC0018660; NSF-PHY-1748958; FG02-08ER46544; EP/I032487/1; AC05-00OR22725

OSTI ID:: 1658379

Alternate ID(s):: OSTI ID: 1497930; OSTI ID: 1761772

Journal Information:: Physical Review Letters, Vol. 122, Issue 9; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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