Journal Article

FZJ-2019-06643

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Intertwined dipolar and multipolar order in the triangular-lattice magnet TmMgGaO4

Shen, Y. ; Liu, C. ; Qin, Y. ; Shen, S. ; Li, Y.-D.Extern* ; Bewley, R. ; Schneidewind, A.FZJ* ; Chen, G. (Corresponding author)Extern* ; Zhao, J. (Corresponding author)

2019
Nature Publishing Group UK [London]

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Please use a persistent id in citations: http://hdl.handle.net/2128/23693  doi:10.1038/s41467-019-12410-3

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.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. PANDA: Cold three axes spectrometer (SR2)

Appears in the scientific report 2019

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