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

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 th

SUBMITTER: Shen Y 

PROVIDER: S-EPMC6783407 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature