This title appears in the Scientific Report :
2020
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevX.10.011007 in citations.
Please use the identifier: http://hdl.handle.net/2128/23843 in citations.
Partial Up-Up-Down Order with the Continuously Distributed Order Parameter in the Triangular Antiferromagnet TmMgGaO 4
Partial Up-Up-Down Order with the Continuously Distributed Order Parameter in the Triangular Antiferromagnet TmMgGaO 4
We 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...
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Personal Name(s): | Li, Yuesheng (Corresponding author) |
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Bachus, Sebastian / Deng, Hao / Schmidt, Wolfgang / Thoma, Henrik / Hutanu, Vladimir / Tokiwa, Yoshifumi / Tsirlin, Alexander A. / Gegenwart, Philipp | |
Contributing Institute: |
JARA-FIT; JARA-FIT Streumethoden; PGI-4 Heinz Maier-Leibnitz Zentrum; MLZ JCNS-ILL; JCNS-ILL Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Physical review / X, 10 (2020) 1, S. 011007 |
Imprint: |
College Park, Md.
APS
2020
|
DOI: |
10.1103/PhysRevX.10.011007 |
Document Type: |
Journal Article |
Research Program: |
Materials and Processes for Energy and Transport Technologies Quantum Condensed Matter: Magnetism, Superconductivity Controlling Collective States Jülich Centre for Neutron Research (JCNS) FRM II / MLZ Controlling Collective States |
Subject (ZB): | |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/23843 in citations.
We 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. |