Observing Monopoles in a Magnetic Analog of Ice

  title={Observing Monopoles in a Magnetic Analog of Ice},
  author={Michel J. P. Gingras},
  pages={375 - 376}
Experimental evidence has been found that magnetic poles within metal oxide magnets can be separated. A bar magnet has a north and south pole, and cutting it in half just creates two new poles, not two separated monopoles. However, a recent theoretical proposal suggested that defects in the spin alignment of certain oxide magnets can create separated effective magnetic monopoles (1). These materials are called spin ices because the lowest-energy orientation of the magnetic spins closely mimics… 

Electric dipoles on magnetic monopoles in spin ice.

It is shown that, besides magnetic charge, there should be an electric dipole attached to each magnetic monopole, which opens new possibilities to study and control such monopoles using an electric field.

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

During recent years the interest to frustrated magnets has grown considerably. Such systems reveal very peculiar properties which distinguish them from standard paramagnets, magnetically ordered

Revealing magnetic ground state of a layered cathode material by muon spin relaxation and neutron scattering experiments

Although the majority of studies on battery materials have focused on enhancing their electrochemical performance, the understanding of their magnetic and atomic structures as well as the intimate

Molecular EM Fields and Dynamical Responses in Solids with Magnetic Charges

The monopoles are theoretically deflned as charges which produce flelds whose divergence is, obviously, difierent from zero. However, the entities which have been experimentally detected in the

Experimental Identification of Electric Dipoles Induced by Magnetic Monopoles in Tb_{2}Ti_{2}O_{7}.

The finding demonstrates that the scenario of magnetic monopole having both magnetic charge and electric dipole is realized in Tb_{2}Ti{2}O_{7} and sheds light into the coupling between electricity and magnetism of Magnetic monopoles in spin frustrated systems.

Magnetic Order with Fractionalized Excitations in Pyrochlore Magnets with Strong Spin-Orbit Coupling

Using the fermionic parton mean field theory, it is shown that the magnetically ordered state with fractionalized excitations can arise as a stable mean field ground state in the presence of sufficiently strong quantum fluctuations.

Electric and Magnetic Fields Due to Massive Photons and Their Consequences

Allowing photons to bear mass, the electric and magnetic flelds of a steadily moving charge are no longer perpendicular to each other, as anticipated from Biot-Savart law. The electric and magnetic

Towards spinor condensates at ultralow magnetic field : creating dipolar quantum gases

This thesis outlines the design and construction of an experiment to investigate dipolar interactions within a rubidium-87 (\(^8\)\(^7\)Rb) spinor Bose-Einstein condensate (BEC). For dipolar

Defect QED: dielectric without a dielectric, monopole without a monopole

Abstract We study a class of defect quantum field theories where the quantum field theory in the 3+1-dimensional bulk is a free photon and charged matter and the interactions of the photons with

Thermal string excitations in artificial spin-ice square dipolar array.

By kinetic Monte Carlo simulations, this work addresses the thermal stability of thermal magnetic string excitations in the square lattice and finds large increments especially for low temperatures and for string excitation with quasi-monopoles of charges.



Dirac Strings and Magnetic Monopoles in the Spin Ice Dy2Ti2O7

Magnetic Monopoles Magnets come with a north and a south pole. Despite being predicted to exist, searches in astronomy and in high-energy particle physics experiments for magnetic monopoles (either

Magnetic Coulomb Phase in the Spin Ice Ho2Ti2O7

P polarized neutron scattering is used to show that the spin-ice material Ho2Ti2O7 exhibits an almost perfect Coulomb phase, which proves the existence of such phases in magnetic materials and strongly supports the magnetic monopole theory of spin ice.

Magnetic monopoles in spin ice

This work proposes that magnetic monopoles emerge in a class of exotic magnets known collectively as spin ice: the dipole moment of the underlying electronic degrees of freedom fractionalises into monopoles, which would account for a mysterious phase transition observed experimentally in spin ice in a magnetic field.

Monopole and Dirac string Dynamics in Spin Ice

Magnetic monopoles have eluded experimental detection since their prediction nearly a century ago by Dirac. Recently it has been shown that classical analogues of these enigmatic particles occur as

Pinch points and Kasteleyn transitions in kagome ice

Complex disordered states—from liquids and glasses to exotic quantum matter—are ubiquitous in nature. Their key properties include finite entropy, power-law correlations and emergent organizing

Spin Ice State in Frustrated Magnetic Pyrochlore Materials

The essential physics of spin ice, as it is currently understood, is described and new avenues for future research on related materials and models are identified.

Zero-point entropy in ‘spin ice’

Common water ice (ice Ih) is an unusual solid—the oxygen atoms form a periodic structure but the hydrogen atoms are highly disordered due to there being two inequivalent O–H bond lengths. Pauling

Dy2Ti2O7 spin ice: a test case for emergent clusters in a frustrated magnet.

A highly refined microscopic theory of Dy2Ti2O7 is presented that includes long-range dipolar and exchange interactions to third nearest neighbors and which demonstrates that the clusters are purely fictitious in this material.

Dynamically induced frustration as a route to a quantum spin ice state in Tb2Ti2O7 via virtual crystal field excitations and quantum many-body effects.

The Tb2Ti2O7 pyrochlore magnetic material is reinvestigate the theoretical description of this material by considering a quantum model of independent tetrahedra to describe its low-temperature properties and is argued to be a quantum spin ice.


We report a detailed study of the pyrochlore Ho{sub 2}Ti{sub 2}O{sub 7}, in which the magnetic ions (Ho{sup 3+}) are ferromagnetically coupled with J{approximately}1 K . We show that the presence of