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  Anisotropic field-induced ordering in the triangular-lattice quantum spin liquid NaYbSe2

Ranjith, K. M., Luther, S., Reimann, T., Schmidt, B., Schlender, P., Sichelschmidt, J., et al. (2019). Anisotropic field-induced ordering in the triangular-lattice quantum spin liquid NaYbSe2. Physical Review B, 100(22): 224417, pp. 1-11. doi:10.1103/PhysRevB.100.224417.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-6DDE-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-6DE0-4
Genre: Journal Article

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Ranjith, K. M.1, Author              
Luther, S.2, Author
Reimann, T.2, Author
Schmidt, B.3, Author              
Schlender, Ph.2, Author
Sichelschmidt, J.4, Author              
Yasuoka, H.1, Author              
Strydom, A. M.1, Author              
Skourski, Y.2, Author
Wosnitza, J.2, Author
Kühne, H.2, Author
Doert, Th2, Author
Baenitz, M.5, Author              
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              
3Burkhard Schmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863464              
4Jörg Sichelschmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863468              
5Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              

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 Abstract: High-quality single crystals of NaYbSe2, which resembles a perfect triangular-lattice antiferromagnet without intrinsic disorder, are investigated by magnetization and specific heat, as well as the local probe techniques nuclear magnetic resonance (NMR) and electron spin resonance. The low-field measurements confirm the absence of any spin freezing or long-range magnetic order down to 50 mK, which suggests a quantum spin liquid ground (QSL) state with gapless excitations. Instability of the QSL state is observed upon applying magnetic fields. For the H perpendicular to c direction, a field-induced magnetic phase transition is observed above 2 T from the C-p(T ) data, agreeing with a clear M-x/3 plateau of M(H), which is associated with an up-up-down spin arrangement. For the H parallel to c direction, a field-induced transition could be evidenced at a much higher field range (9-21 T). The Na-23 NMR measurements provide microscopic evidence of field-induced ordering for both directions. A reentrant behavior of T-N, originating from the thermal and quantum spin fluctuations, is observed for both directions. The anisotropic exchange interactions J _ similar or equal to 4.7 K and J(z) similar or equal to 2.33 K are extracted from the modified bond-dependent XXZ model for the spin-1/2 triangular-lattice antiferromagnet. The absence of magnetic long-range order at zero fields is assigned to the effect of strong bond frustration, arising from the complex spin-orbit entangled 4f ground state. Finally, we derive the highly anisotropic magnetic phase diagram, which is discussed in comparison with the existing theoretical models for spin-1/2 triangular-lattice antiferromagnets.

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Language(s): eng - English
 Dates: 2019-12-192019-12-19
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 100 (22) Sequence Number: 224417 Start / End Page: 1 - 11 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008