Supercooled Jahn-Teller Ice
arXiv:2202.05513 · doi:10.1103/PhysRevResearch.4.033157
Abstract
When the spins on the frustrated pyrochlore lattice obey the celebrated 2--2- ice rule, they stay in a correlated disordered phase and break the third law of thermodynamics. Similarly, if the atomic ions on the pyrochlore lattice move in and outward of the tetrahedra, they may obey a constraint resembling the ice rule. We discover that a model for pyrochlore molybdates MoO (Y, Dy, Tb) exhibits a "supercooled ice" state of the displacement degrees of freedom of Mo ions, when we take account of the Jahn-Teller (JT) effect. The JT effect occurs when the lattice distortions reduce the symmetry of the local crystal field, resulting in the orbital-energy-splitting that causes the local energy gain. Unlike the standard JT effect that leads to periodic long range ordering, the displacements of Mo ions are disordered following the ice-like rule. We microscopically derive a model that describes this situation by having the 2nd and 3rd neighbor interactions between in-out lattice displacements comparably as strong as the nearest neighbor interactions of standard ice. There, the well-known nearly flat energy landscape of the ice state is altered to a metastable highly quasi-degenerate ice-like liquid state coexisting with a crystalline-like ground state. Our Monte Carlo simulations show that this liquid remains remarkably stable down to low temperatures by avoiding the putative first order transition. The relaxation in the supercooled JT ice state exhibits glassy dynamics with a plateau structure. They fit the feature of a "good glassformer" very often found in molecular liquids, but that has never been observed in material solids. The high glass-forming ability of the interacting lattice degrees of freedom will play a key role in the spin-glass transition of the material.
arXiv comment18 pages, 14 figures
References in corpus (24)
- Magnetic Pyrochlore Oxides
- Supercooled Liquids for Pedestrians
- Pyrochlore Photons: The U(1) Spin Liquid in a S=1/2 Three-Dimensional Frustrated Magnet
- Long Range Order at Low Temperature in Dipolar Spin Ice
- Static Critical Behavior of the Spin-Freezing Transition in the Geometrically Frustrated Pyrochlore Antiferromagnet Y2Mo2O7
- Generic quantum spin ice
- Spin singlet formation in MgTiO: evidence of a helical dimerization pattern
- Magnetic anisotropy of the spin ice compound Dy2Ti2O7
- A ferromagnet with a glass transition
- Muon Spin Relaxation Investigation of the Spin Dynamics of Geometrically Frustrated Antiferromagnets Y2Mo2O7 and Tb2Mo2O7 Static Critical Behavior of the Spin-Freezing
- Spin Freezing in Geometrically Frustrated Antiferromagnets with Weak Disorder
- Charge-cluster glass in an organic conductor
- Local lattice disorder in the geometrically-frustrated spin glass pyrochlore Y2Mo2O7
- Effects of Crystal Structure and the On-Site Coulomb Interactions on the Electronic and Magnetic Structure of Pyrochlores MoO (A= Y, Gd, and Nd)
- From Spin Glass to Quantum Spin Liquid Ground States in Molybdate Pyrochlores
- Spin-glass transition in bond-disordered Heisenberg antiferromagnets coupled with local lattice distortions on a pyrochlore lattice
- Spin slush in an extended spin ice model
- Orbital Dimer Model for Spin-Glass State in YMoO
- Ordering of the pyrochlore Ising model with the long-range RKKY interaction
- When opposites repel: from metastability to extended chiral spin textures in spin ice with short-range topological-defect interactions
- Spin-orbital glass transition in a model of a frustrated pyrochlore magnet without quenched disorder
- Disorder-free spin glass transitions and jamming in exactly solvable mean-field models
- Giant Magnetoelastic-Coupling Driven Spin-Lattice Liquid State in Molybdate Pyrochlores
- Mean-field phase diagram and spin glass phase of the dipolar Kagome Ising antiferromagnet