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- W3046177544 abstract "Frustrated quasidoublets without time-reversal symmetry can host highly unconventional magnetic structures with continuously distributed order parameters even in a single-phase crystal. Here, we report the comprehensive thermodynamic and neutron diffraction investigation on the single crystal of TmMgGaO$_4$, which entails non-Kramers Tm$^{3+}$ ions arranged on a geometrically perfect triangular lattice. The crystal electric field (CEF) randomness caused by the site-mixing disorder of the nonmagnetic Mg$^{2+}$ and Ga$^{3+}$ ions, merges two lowest-lying CEF singlets of Tm$^{3+}$ into a ground-state (GS) quasidoublet. Well below $T_c$ $sim$ 0.7 K, a small fraction of the antiferromagnetically coupled Tm$^{3+}$ Ising quasidoublets with small inner gaps condense into two-dimensional (2D) up-up-down magnetic structures with continuously distributed order parameters, and give rise to the emph{columnar} magnetic neutron reflections below $mu_0H_c$ $sim$ 2.6 T, with highly anisotropic correlation lengths, $xi_{ab}$ $geq$ 250$a$ in the triangular plane and $xi_c$ $<$ $c$/12 between the planes. The remaining fraction of the Tm$^{3+}$ 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 GS quasidoublets." @default.
- W3046177544 created "2020-08-03" @default.
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- W3046177544 date "2020-01-10" @default.
- W3046177544 modified "2023-10-01" @default.
- W3046177544 title "Partial Up-Up-Down Order with the Continuously Distributed Order Parameter in the Triangular Antiferromagnet <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>TmMgGaO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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- W3046177544 doi "https://doi.org/10.1103/physrevx.10.011007" @default.
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