The Polarized Monopole Liquid: a Coulomb phase in a fluid of magnetic charges
arXiv:1903.11493 · doi:10.1103/PhysRevB.100.020405
Abstract
The forging of strong correlations on decreasing temperature can take place without the arousal of conventional order. If this happens, as in some geometrically frustrated magnets, disorder can be a phenomenon more interesting than order itself. A Coulomb phase, for example, has critical-like pair-spin correlations, leading to neutron scattering \textit{pinch points} and emergent electromagnetism. Here we present a new instance of disorder in an Ising pyrochlore lattice: the \textit{Polarized Monopole Liquid} (PML), a dense monopole fluid with pinch points in the \textit{magnetic charge}-pair correlations. It is a phase of "monopole matter" never considered before which, in principle, can be stabilized in real materials using a magnetic field and uniaxial stress along the [100] direction. To explain how the monopole correlations arise, we show that the PML is a Coulomb phase in which spin fluctuations cannot be assigned either to monopoles or to internal magnetic moments, but necessarily comprehend both degrees of freedom. We develop a simple but nontrivial method to Helmholtz decompose the spin field into a divergenceless and a divergenceful part in magnetic charge disordered pyrochlores that shows the appearance of pinch points associated to the divergenceful component in places where Bragg peaks are observed for the "all-in/all-out" antiferromagnet.
References in corpus (32)
- Spin Ice State in Frustrated Magnetic Pyrochlore Materials
- Magnetic Monopoles in Spin Ice
- Pyrochlore Photons: The U(1) Spin Liquid in a S=1/2 Three-Dimensional Frustrated Magnet
- Dirac Strings and Magnetic Monopoles in Spin Ice Dy2Ti2O7
- Low-temperature properties of classical, geometrically frustrated antiferromagnets
- The "Coulomb phase" in frustrated systems
- Signature of magnetic monopole and Dirac string dynamics in spin ice
- Strong Peak in of SrRuO Under Uniaxial Pressure
- Coulomb and Liquid Dimer Models in Three Dimensions
- Thermodynamic Properties of the Dipolar Spin Ice Model
- Two-stage ordering of spins in a dipolar spin ice on the kagome lattice
- Piezoelectric-based apparatus for strain tuning
- Magnetic-Moment Fragmentation and Monopole Crystallization
- Theory of the [111] magnetization plateau in spin ice
- Fragmentation of magnetism in artificial kagome dipolar spin ice
- Pinch Points and Kasteleyn Transitions: How Spin Ice Changes its Entropy
- A Three Dimensional Kasteleyn Transition: Spin Ice in a [100] Field
- Manifestation of geometric frustration on magnetic and thermodynamic properties of pyrochlores (X=Ti, Zr)
- Quantum effects in a half-polarized pyrochlore antiferromagnet
- Spin liquid correlations, anisotropic exchange and symmetry breaking in Tb2Ti2O7
- Extended quantum U(1)-liquid phase in a three-dimensional quantum dimer model
- Spin slush in an extended spin ice model
- Spin ice under pressure: symmetry enhancement and infinite order multicriticality
- Charge ordering in a pure spin model: dipolar spin-ice
- When opposites repel: from metastability to extended chiral spin textures in spin ice with short-range topological-defect interactions
- Multiferroicity in spin ice: towards a magnetic crystallography of Tb2Ti2O7 in a field
- Magnetic correlations in spin ice Ho2-xYxTi2O7 as revealed by neutron polarization analysis
- Monopole ordered phases in dipolar and nearest-neighbours Ising pyrochlore: from spin ice to the "all-in--all-out" antiferromagnet
- Field-tuned order by disorder in Ising frustrated magnets with antiferromagnetic interactions
- Monopole holes in a partially ordered spin liquid
- Double-layered monopolar order in Tb2Ti2O7 spin liquid
- Charge and spin correlations in the Monopole Liquid