Novel Strongly Spin-Orbit Coupled Quantum Dimer Magnet: Yb_{2}Si_{2}O_{7}

Physical Review Letters
Gavin HesterK A Ross

Abstract

The quantum dimer magnet (QDM) is the canonical example of quantum magnetism. The QDM state consists of entangled nearest-neighbor spin dimers and often exhibits a field-induced triplon Bose-Einstein condensate (BEC) phase. We report on a new QDM in the strongly spin-orbit coupled, distorted honeycomb-lattice material Yb_{2}Si_{2}O_{7}. Our single crystal neutron scattering, specific heat, and ultrasound velocity measurements reveal a gapped singlet ground state at zero field with sharp, dispersive excitations. We find a field-induced magnetically ordered phase reminiscent of a BEC phase, with exceptionally low critical fields of H_{c1}∼0.4 and H_{c2}∼1.4  T. Using inelastic neutron scattering in an applied magnetic field we observe a Goldstone mode (gapless to within δE=0.037  meV) that persists throughout the entire field-induced magnetically ordered phase, suggestive of the spontaneous breaking of U(1) symmetry expected for a triplon BEC. However, in contrast to other well-known cases of this phase, the high-field (μ_{0}H≥1.2  T) part of the phase diagram in Yb_{2}Si_{2}O_{7} is interrupted by an unusual regime signaled by a change in the field dependence of the ultrasound velocity and magnetization, as well as the disappear...Continue Reading

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Citations

Feb 12, 2019·Nature Communications·L S WuA Podlesnyak
Jun 20, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·S E Nagler, D A Tennant
Dec 23, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Gavin Lee HesterK Ross
Feb 27, 2021·Physical Review Letters·Michael O FlynnRajiv R P Singh
Jul 13, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Gavin HesterK A Ross

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