Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B54: Triangular Lattices
11:30 AM–2:18 PM,
Monday, March 6, 2023
Room: Room 306
Sponsoring
Unit:
GMAG
Chair: Duminda Sanjeew, University of Missouri
Abstract: B54.00004 : Competition between stripy and 120-degree spin correlations in the spin glass ground state of the triangular quantum antiferromagnet ErMgGaO4*
12:30 PM–12:42 PM
Presenter:
Hsiao-Yuan (Symphony) Huang
(McMaster University)
Authors:
Hsiao-Yuan (Symphony) Huang
(McMaster University)
Sylvain Petit
(Laboratoire Leon Brillouin)
Zachary W Cronkwright
(McMaster University)
Evan M Smith
(McMaster University)
Suvam Bhattacharya
(Universite Paris-Saclay)
Jean-Marc Zanotti
(Institut Laue Langevin)
Quentin Berrod
(Institut Laue Langevin)
Edwin Kermarrec
(Universite Paris-Saclay)
Bruce D Gaulin
(McMaster University)
decorate two-dimensional triangular planes separated by disordered non-magnetic bilayers of Mg2+
and Ga3+. Its sister compound, YbMgGaO4, has attracted much interest as a quantum spin liquid
ground state candidate, although the presence of the disordered Mg-Ga bilayers add complexity to
this description. In contrast, ErMgGaO4 shows a clear spin glass transition near Tg ∼ 2 K, about 1/3
of its Curie-Weiss temperature. We have carried out new inelastic neutron scattering measurements
on powder ErMgGaO4 samples, which show the frozen elastic component of the scattering to develop
below Tg. It is separated by a ∼ 0.25 meV gap from a continuum of dynamic spectral weight
with a ∼ 0.75 meV bandwidth. The frozen (elastic) and fluctuating (inelastic) spin correlations are
analysed separately, using a combination of reverse Monte Carlo and Warren lineshape analysis.
These are consistent with fluctuating 120-degree spin correlations at all temperatures, and the development
of competing stripy static correlations below Tg.
*NSERC of Canada
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