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000872664 1001_ $$00000-0002-5967-3061$$aLi, Yuesheng$$b0$$eCorresponding author
000872664 245__ $$aPartial Up-Up-Down Order with the Continuously Distributed Order Parameter in the Triangular Antiferromagnet TmMgGaO 4
000872664 260__ $$aCollege Park, Md.$$bAPS$$c2020
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000872664 520__ $$aWe show that frustrated quasidoublets without time-reversal symmetry can host highly unconventional magnetic structures with continuously distributed order parameters even in a single-phase crystal. Our study comprises a comprehensive thermodynamic and neutron diffraction investigation on the single crystal of TmMgGaO4, which entails non-Kramers Tm3+ ions arranged on a geometrically perfect triangular lattice. The crystal electric field randomness caused by the site-mixing disorder of the nonmagnetic Mg2+ and Ga3+ ions merges two lowest-lying crystal electric field singlets of Tm3+ into a ground-state quasidoublet. Well below Tc∼0.7  K, a small fraction of the antiferromagnetically coupled Tm3+ Ising quasidoublets with small inner gaps condense into two-dimensional up-up-down magnetic structures with continuously distributed order parameters, and give rise to the columnar magnetic neutron reflections below μ0Hc∼2.6  T, with highly anisotropic correlation lengths, ξab≥250a in the triangular plane and ξc<c/12 between the planes. The remaining fraction of the Tm3+ ions remain nonmagnetic at 0 T and become uniformly polarized by the applied longitudinal field at low temperatures. We argue that the similar model can be generally applied to other compounds of non-Kramers rare-earth ions with correlated ground-state quasidoublets.
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000872664 7001_ $$0P:(DE-HGF)0$$aBachus, Sebastian$$b1
000872664 7001_ $$00000-0002-4668-241X$$aDeng, Hao$$b2
000872664 7001_ $$0P:(DE-Juel1)130944$$aSchmidt, Wolfgang$$b3
000872664 7001_ $$0P:(DE-Juel1)176326$$aThoma, Henrik$$b4
000872664 7001_ $$0P:(DE-Juel1)164298$$aHutanu, Vladimir$$b5
000872664 7001_ $$0P:(DE-HGF)0$$aTokiwa, Yoshifumi$$b6
000872664 7001_ $$0P:(DE-HGF)0$$aTsirlin, Alexander A.$$b7
000872664 7001_ $$0P:(DE-HGF)0$$aGegenwart, Philipp$$b8
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