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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Shen Y,Liu C,Qin Y,Shen S,Li YD,Bewley R,Schneidewind A,Chen G,Zhao Jdoi
10.1038/s41467-019-12410-3subject
Has Abstractpub_date
2019-10-08 00:00:00pages
4530issue
1issn
2041-1723pii
10.1038/s41467-019-12410-3journal_volume
10pub_type
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