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Continuous excitations of the triangular-lattice quantum spin liquid YbMgGaO4
Open accessAbstract
A detailed and systematic neutron-scattering study uncovers a continuum of magnetic excitations down to 0.06 K in the triangular quantum magnet YbMgGaO4 — an observation consistent with quantum spin liquid behaviour. A quantum spin liquid (QSL) is an exotic state of matter in which electrons’ spins are quantum entangled over long distances, but do not show magnetic order in the zero-temperature limit1. The observation of QSL states is a central aim of experimental physics, because they host collective excitations that transcend our knowledge of quantum matter; however, examples in real materials are scarce2. Here, we report neutron-scattering experiments on YbMgGaO4, a QSL candidate in which Yb3+ ions with effective spin-1/2 occupy a triangular lattice3,4,5,6. Our measurements reveal a continuum of magnetic excitations—the essential experimental hallmark of a QSL7—at very low temperature (0.06 K). The origin of this peculiar excitation spectrum is a crucial question, because isotropic nearest-neighbour interactions do not yield a QSL ground state on the triangular lattice8. Using measurements in the field-polarized state, we identify antiferromagnetic next-nearest-neighbour interactions9,10,11,12, spin-space anisotropies4,10,13,14, and chemical disorder15 between the magnetic layers as key ingredients in YbMgGaO4.
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Metadata
- Authors
- Paddison, J. A. M., Daum, M., Dun, Z., Ehlers, G., Liu, Y., Stone, M. B., Zhou, H., & Mourigal, M.
- Venue
- Nature Physics
- Published
- 2016-12-05
- Volume
- 13
- Issue
- 2
- Pages
- 117-122
- ISSN
- 1745-2473 (ISSN-L)
- 1745-2481
- OpenAlex
- W2493260713
- Cited by
- 423
- References
- 30
- FWCI
- 24.08
- Type
- journal article
- Language
- en
- Open access
- green
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