Intertwined dipolar and multipolar order in the triangular-lattice magnet TmMgGaO4

Yao Shen, Changle Liu, Yayuan Qin, Shoudong Shen, Yao-Dong Li, Robert Bewley, Astrid Schneidewind, Gang Chen () and Jun Zhao ()
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Yao Shen: Fudan University
Changle Liu: Fudan University
Yayuan Qin: Fudan University
Shoudong Shen: Fudan University
Yao-Dong Li: Fudan University
Robert Bewley: ISIS Facility, Rutherford Appleton Laboratory, STFC, Chilton
Astrid Schneidewind: Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1
Gang Chen: Fudan University
Jun Zhao: Fudan University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract A phase transition is often accompanied by the appearance of an order parameter and symmetry breaking. Certain magnetic materials exhibit exotic hidden-order phases, in which the order parameters are not directly accessible to conventional magnetic measurements. Thus, experimental identification and theoretical understanding of a hidden order are difficult. Here we combine neutron scattering and thermodynamic probes to study the newly discovered rare-earth triangular-lattice magnet TmMgGaO4. Clear magnetic Bragg peaks at K points are observed in the elastic neutron diffraction measurements. More interesting, however, is the observation of sharp and highly dispersive spin excitations that cannot be explained by a magnetic dipolar order, but instead is the direct consequence of the underlying multipolar order that is “hidden” in the neutron diffraction experiments. We demonstrate that the observed unusual spin correlations and thermodynamics can be accurately described by a transverse field Ising model on the triangular lattice with an intertwined dipolar and ferro-multipolar order.

Date: 2019
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DOI: 10.1038/s41467-019-12410-3

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