Field evolution of the spin-liquid candidate YbMgGaO${}_4$

Abstract

We report magnetization, heat capacity, thermal expansion, and magnetostriction measurements down to millikelvin temperatures on the triangular antiferromagnet YbMgGaO${}_4$. Our data exclude the formation of the distinct $\frac{1}{3}$ plateau phase observed in other triangular antiferromagnets, but reveal plateaulike features in second derivatives of the free energy, magnetic susceptibility and specific heat, at ${\mu }_{0}H$ = 1.0 - 2.5 T for $H\parallel c$ and 2 - 5 T for $H\perp c$. Using Monte-Carlo simulations of a realistic spin Hamiltonian, we ascribe these features to nonmonotonic changes in the magnetization and the $\frac{1}{2}$ plateau that is smeared out by the random distribution of exchange couplings in YbMgGaO${}_4$.

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• Survival of itinerant excitations and quantum spin state transitions in YbMgGaO${}_4$ with chemical disorder
• Spectral function of the $J_1-J_2$ Heisenberg model on the triangular lattice
• Magnetic field effects on the quantum spin liquid behaviors of NaYbS${}_2$
• Disorder-induced broadening of the spin waves in a triangular-lattice quantum-spin-liquid candidate YbZnGaO${}_4$
• Exact diagonalization study of the anisotropic Heisenberg model related to YbMgGaO${}_4$
• Phase Diagram of YbZnGaO4 in Applied Magnetic Field
• Constraining the Parameter Space of a Quantum Spin Liquid Candidate in Applied Field with Iterative Optimization
• Giant Magnetocaloric Effect in a Honeycomb Spiral Spin-Liquid Candidate
• Magnetization process of a quasi-two-dimensional quantum magnet: Two-step symmetry restoration and dimensional reduction
• Magnetic and magnetocaloric effect in the stuffed honeycomb antiferromagnet GdInO3 polycrystalline