Observation of Magnetic Monopoles in Spin Ice

Abstract

Excitations from a strongly frustrated system, the kagome ice state of the spin ice Dy2Ti2O7 under magnetic fields along a [111] direction, have been studied. They are theoretically proposed to be regarded as magnetic monopoles. Neutron scattering measurements of spin correlations show that close to the critical point the monopoles are fluctuating between high- and low-density states, supporting that the magnetic Coulomb force acts between them. Specific heat measurements show that monopole-pair creation obeys an Arrhenius law, indicating that the density of monopoles can be controlled by temperature and magnetic field.

5 pages, 4 figures; International Conference on Neutron Scattering 2009 (May 7); J. Phys. Soc. Jpn. 78, No.10 (2009) (Received Aug 11, 2009; accepted Sept 8, 2009; published Oct 13, 2009)

References in corpus (13)

• Spin Ice State in Frustrated Magnetic Pyrochlore Materials
• Magnetic Monopoles in Spin Ice
• Anomalous Hall Effect and Magnetic Monopoles in Momentum-Space
• Seeing the magnetic monopole through the mirror of topological surface states
• Dipolar Interactions and Origin of Spin Ice in Ising Pyrochlore Magnets
• Signature of magnetic monopole and Dirac string dynamics in spin ice
• Theoretical and Experimental Status of Magnetic Monopoles
• Theory of the [111] magnetization plateau in spin ice
• Pinch Points and Kasteleyn Transitions: How Spin Ice Changes its Entropy
• Kagomé ice state in the dipolar spin ice Dy_{2}Ti_{2}O_{7}
• Fractional charges in pyrochlore lattices
• Lattice Models of Ionic Systems
• Low Temperature Specific Heat of Dy${}_2$Ti${}_2$O${}_7$ in the Kagome Ice State

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• Colloquium: Artificial spin ice: Designing and imaging magnetic frustration
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• The "Coulomb phase" in frustrated systems
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• Fractional spinon excitations in the quantum Heisenberg antiferromagnetic chain
• Seeing the light : experimental signatures of emergent electromagnetism in a quantum spin ice
• Quantum Ice : a quantum Monte Carlo study
• Magnetic Monopole Dynamics in Spin Ice
• Debye-Hückel theory for spin ice at low temperature
• Vacancy defects and monopole dynamics in oxygen-deficient pyrochlores
• Conditions for free magnetic monopoles in nanoscale square arrays of dipolar spin ice
• Electric dipoles on magnetic monopoles in spin ice
• Thermal quenches in spin ice
• Spin Dynamics at Very Low Temperature in Spin Ice Dy${}_2$Ti${}_2$O${}_7$
• Noninteger-spin magnonic excitations in untextured magnets
• Brownian Motion and Quantum Dynamics of Magnetic Monopoles in Spin Ice
• Dynamics of the Magnetic Susceptibility Deep in the Coulomb Phase of the Dipolar Spin Ice Material Ho2Ti2O7
• Bosonic Many-body Theory of Quantum Spin Ice
• Atomic displacements in the "charge-ice" pyrochlore Bi2Ti2O7 studied by neutron total scattering
• Thermodynamics of elementary excitations in artificial magnetic square ice
• Dynamics of artificial spin ice: continuous honeycomb network
• Characterization of quantum spin liquids and their spinon band structures via functional renormalization
• Topological Sector Fluctuations and Curie Law Crossover in Spin Ice
• New physics in frustrated magnets: Spin ices, monopoles, etc
• Extending spin ice concepts to another geometry: the artificial triangular spin ice
• Charge Fractionalization in a Kondo Device
• Coulomb phase diagnostics as function of temperature, interaction range and disorder
• Thermal Conductivity and Specific Heat of the Spin-Ice Compound Dy${}_2$Ti${}_2$O${}_7$: Experimental Evidence for Monopole Heat Transport
• Quantum versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho3Mg2Sb3O14
• Spin Ice Thin Film: Surface Ordering, Partial Magnetic Wetting and Emergent Square Ice
• Monopole density and antiferromagnetic domain control in spin-ice iridates
• Magnetic correlations in spin ice Ho2-xYxTi2O7 as revealed by neutron polarization analysis
• Realization of Rectangular Artificial Spin Ice and Direct Observation of High Energy Topology
• Monopole ordered phases in dipolar and nearest-neighbours Ising pyrochlore: from spin ice to the "all-in--all-out" antiferromagnet
• Ultrasonic investigations of spin-ices Dy${}_2$Ti${}_2$O${}_7$ and Ho${}_2$Ti${}_2$O${}_7$ in and out of equilibrium
• A field trip through spin ice
• Generalised Longitudinal Susceptibility for Magnetic Monopoles in Spin Ice
• Monopole holes in a partially ordered spin liquid
• An irreversible magnetic-field dependence of low-temperature heat transport of spin-ice compound Dy_2Ti_2O_7 in a [111] field
• Double-layered monopolar order in Tb2Ti2O7 spin liquid
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• Intrinsic and extrinsic nonstationary field-driven processes in the spin-ice compound Dy2Ti2O7
• Low-temperature thermal conductivity of Dy_2Ti_2O_7 and Yb_2Ti_2O_7 single crystals
• Field-Induced magnetic structures in Tb2Ti2O7 at low temperatures: From spin-ice to spin-flip structures
• Suppression of Pauling's Residual Entropy in Dilute Spin Ice (Dy${}_{1-x}$Y${}_x$)${}_2$Ti${}_2$O${}_7$
• Vortex-crystal pattern in an anti-artificial spin ice system
• Coulombic Charge Ice
• Rod motifs in neutron scattering in spin ice
• Heat transport of the spin-ice materials Ho${}_2$Ti${}_2$O${}_7$ and Dy${}_2$Ti${}_2$O${}_7$
• Emergent order in the spin-frustrated system DyxTb2-xTi2O7 studied by ac susceptibility measurements
• Deviation from the dipole-ice model in the new spinel spin-ice candidate, MgEr${}_2$Se${}_4$
• Field-rotational magnetocaloric effect: A new experimental technique for accurate measurement of the anisotropic magnetic entropy
• Continuum excitation and pseudospin wave in quantum spin-liquid and quadrupole ordered states of Tb${}_{2+x}$Ti${}_{2-x}$O${}_{7+y}$
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• Low-temperature muon spin rotation studies of the monopole charges and currents in Y doped Ho2Ti2O7
• Emergence of weak pyrochlore phase and signature of field induced spin ice ground state in Dy${}_{2-x}$La${}_x$Zr${}_2$O${}_7$; x = 0, 0.15, 0.3
• Magnetic properties and magnetic structure of the frustrated quasi-one-dimensional antiferromagnet SrCuTe${}_2$O${}_6$
• Spin correlations of quantum-spin-liquid and quadrupole-ordered states of Tb${}_{2+x}$Ti${}_{2-x}$O${}_{7+y}$
• Magnetotransport of single crystal Sm${}_2$Ir${}_2$O${}_7$ across the pressure-induced quantum-critical phase boundary
• Quantum percolation of monopole paths and the response of quantum spin ice
• Interplay of dilution and magnetic field in the nearest-neighbor spin-ice model on the pyrochlore lattice
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• Monomer-Dimer Mixture on a Honeycomb Lattice
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• Spin ice in a general applied magnetic field: Kasteleyn transition, magnetic torque and rotational magnetocaloric effect
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• Hysteresis and Relaxation Effects in the Spin-Ice Compound Dy${}_2$Ti${}_2$O${}_7$ studied by Heat Transport
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• Metal-insulator transitions in pyrochlore oxides
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• Crossover from string to cluster dynamics following a field quench in spin ice
• Universal dynamics of magnetic monopoles in two-dimensional kagomé ice
• Spin and quadrupole correlations by three-spin interaction in the frustrated pyrochlore magnet Tb${}_{2+x}$Ti${}_{2-x}$O${}_{7+y}$
• Spinor ice correlation in flat-band electronic states on kagome and pyrochlore lattices with spin-orbit coupling
• Ferromagnetic Order of Reduced Magnetic Moments in a Frustrated Sawtooth Chain of the Magnetic Semiconductor ZnYb${}_2$S${}_4$
• Magnetic Scattering Chapter
• Phase Transition and Monopoles Densities in a Nearest Neighbors Two-Dimensional Spin Ice Model