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

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Ranjith,  K. M.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schmidt,  B.
Burkhard Schmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sichelschmidt,  J.
Jörg Sichelschmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Yasuoka,  H.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Strydom,  A. M.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Baenitz,  M.
Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0005-6DDE-8
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.