TY - JOUR
T1 - From One- To Two-Magnon Excitations in the S=3/2 Magnet β-CaCr2 O4
AU - Songvilay, M.
AU - Petit, S.
AU - Damay, F.
AU - Roux, G.
AU - Qureshi, N.
AU - Walker, H. C.
AU - Rodriguez-Rivera, J. A.
AU - Gao, B.
AU - Cheong, S. W.
AU - Stock, C.
N1 - Funding Information:
We acknowledge funding from the EPSRC, STFC and Investissements d’Avenir du LabEx PALM (Grant No. ANR-10-LABX-0039-PALM). We acknowledge the support of the National Institute of Standards and Technology, U.S. Department of Commerce, and Laboratoire Léon Brillouin-Orphée (CEA Saclay, France) in providing the neutron research facilities used in this work. Access to MACS was provided by the Center for High Resolution Neutron Scattering, a partnership between the National Institute of Standards and Technology and the National Science Foundation under Agreement No. DMR-1508249. The work at Rutgers University was supported by the DOE under Grant No. DOE: DE-FG02-07ER46382.
Publisher Copyright:
© 2021 American Physical Society. All rights reserved.
PY - 2021/1/6
Y1 - 2021/1/6
N2 - We apply neutron spectroscopy to measure the magnetic dynamics in the S=3/2 magnet β-CaCr2O4 (TN=21 K). The low-energy fluctuations, in the ordered state, resemble large-S linear spin waves from the incommensurate ground state. However, at higher energy transfers, these semiclassical and harmonic dynamics are replaced by an energy and momentum broadened continuum of excitations. Applying kinematic constraints required for energy and momentum conservation, sum rules of neutron scattering, and comparison against exact diagonalization calculations, we show that the dynamics at high-energy transfers resemble low-S one-dimensional quantum fluctuations. β-CaCr2O4 represents an example of a magnet at the border between classical Néel and quantum phases, displaying dual characteristics.
AB - We apply neutron spectroscopy to measure the magnetic dynamics in the S=3/2 magnet β-CaCr2O4 (TN=21 K). The low-energy fluctuations, in the ordered state, resemble large-S linear spin waves from the incommensurate ground state. However, at higher energy transfers, these semiclassical and harmonic dynamics are replaced by an energy and momentum broadened continuum of excitations. Applying kinematic constraints required for energy and momentum conservation, sum rules of neutron scattering, and comparison against exact diagonalization calculations, we show that the dynamics at high-energy transfers resemble low-S one-dimensional quantum fluctuations. β-CaCr2O4 represents an example of a magnet at the border between classical Néel and quantum phases, displaying dual characteristics.
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U2 - 10.1103/PhysRevLett.126.017201
DO - 10.1103/PhysRevLett.126.017201
M3 - Article
C2 - 33480800
AN - SCOPUS:85099145886
SN - 0031-9007
VL - 126
JO - Physical Review Letters
JF - Physical Review Letters
IS - 1
M1 - 017201
ER -