Measurement of the charge and current of magnetic monopoles in spin ice

Bramwell, S. T.; Giblin, Sean; Calder, Stuart; Aldus, R.; Prabhakaran, D.; Fennell, T.

doi:10.1038/nature08500

Cited by 355 publications

(404 citation statements)

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“…The geometry of certain material structures is particularly prone to frustration, with the resulting degenerate ground states or near-ground states being highly susceptible to small perturbations and the emergence of exotic states of matter 1,2 . For example, frustration imposed by the geometrical arrangement of magnetic moments in electrical insulators induces novel states, such as spin-liquid, multiferroicity and magnetic monopole excitations in spin ice [1][2][3][4][5][6][7] . The absence of itinerant charge and spin degrees of freedom in magnetically frustrated insulators simplifies theoretical modelling of the microscopic origin and consequences of that frustration, and consequently, most studies have focussed on non-metallic materials.…”

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confidence: 99%

Controllable chirality-induced geometrical Hall effect in a frustrated highly correlated metal

et al. 2012

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A current of electrons traversing a landscape of localized spins possessing non-coplanar magnetic order gains a geometrical (Berry) phase, which can lead to a Hall voltage independent of the spin-orbit coupling within the material-a geometrical Hall effect. Here we show that the highly correlated metal uCu 5 possesses an unusually large controllable geometrical Hall effect at T < 1.2 K due to its frustration-induced magnetic order. The magnitude of the Hall response exceeds 20% of the ν = 1 quantum Hall effect per atomic layer, which translates into an effective magnetic field of several hundred Tesla acting on the electrons. The existence of such a large geometric Hall response in uCu 5 opens a new field of enquiry into the importance of the role of frustration in highly correlated electron materials.

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confidence: 99%

Controllable chirality-induced geometrical Hall effect in a frustrated highly correlated metal

et al. 2012

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“…But some key clues of these theories are serving of inspiration for understanding some experimental electromagnetic phenomenology raised on magnetic materials such as the spin-ices [11,12]. The presence of magnetic charges detected within the condensed matter does not correspond to elemental particles, but they are due to the spin flip occurrence in low energy excitation states of magnetic structures, such as the spin-ices, or by means of image states of external electrons in topological insulators [9].…”

Section: Introductionmentioning

confidence: 99%

“…Then the configuration suffers a change in such a way that the magnetic field sources are similar to those due to the existence of micromagnets with two poles, the denominated dumbbells [7,8,[10][11][12]19]. Then, each micromagnet can be considered as a pole-antipole pair which can be broken when the length of the string which form these pairs increases.…”

Section: Introductionmentioning

confidence: 99%

“…A contribution to the interpretation of these monopoles was carried out in 1938 by Jordan [2] and in 1974 Hooft [3] and Polyakov [4] introduced the magnetic monopole idea as a contribution to the second great unification of the three more intense forces, electromagnetic, weak nuclear and strong nuclear interactions. These and other theoretical analysis have provoked that the experimental pursuit of the magnetic monopole manifestation is an issue that is both liminal and subliminally present since 1982 [5] and now is receiving a payment of attention in both high energy physics [6] and solid state (SS) physics [6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The result is a density of dissociated pairs immersed in a system of non broken micromagnets. When the density of deconfined magnetic charges is sufficiently large, the system can be studied as an interacting gas of magnetic charges whose dynamics is controlled by the Coulomb-like interaction [7,8,11,12,19,22] …”

Section: Introductionmentioning

confidence: 99%

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Molecular Em Fields and Dynamical Responses in Solids With Magnetic Charges

Costa‐Quintana¹,

López‐Aguilar²

2011

PIER

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Abstract-The monopoles are theoretically defined as charges which produce fields whose divergence is, obviously, different from zero. However, the entities which have been experimentally detected in the spin-ices, with mimetic behavior to that of the magnetic monopoles, generate magneti c fields which seem to be compatible with ∇ · B = 0. This apparent contradiction can create confusion and therefore it requires explanation. In this paper we have carried out an analysis of the different electromagnetic fields in the spinices materials. We clarify the differences between the average fields of standard Maxwell equations with zero divergence even in spin-ices and the non macroscopic fields when there are magnetic monopoles in these materials. We give the molecular or local fields which allow us to determine the molecular polarizability. We combine the extended Clausius-Mossotti equations with the Lorentz-Drude model for obtaining the extended susceptibility and the optical conductivity which can be used for explaining the action of the electromagnetic fields in spin-ices.

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Magnetic Oxides

Greedan

2017

Encyclopedia of Inorganic and Bioinorganic Chemistry

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The purpose of this chapter is twofold. The first is to provide an introduction to the magnetic properties of matter such that the reader will be able to appreciate the basic details of research papers concerning magnetic oxides. The second is to illustrate the wide range of magnetic behaviors exhibited by magnetic oxides through some well‐chosen examples from the literature from the past few decades to the present. Emphasis has been placed on oxides with the perovskite and related structures such as the Ruddlesden–Popper phases, A‐site and B‐site ordered perovskites, pillared perovskites, and materials with structures related to the hexagonal perovskites. As well, the field of geometrically frustrated magnetic materials is reviewed with emphasis on materials with the pyrochlore, spinel, double perovskite, and related structures. Phenomena exhibited by such compounds include colossal magnetoresistance, charge and orbital ordering, half‐metallic ferromagnetism, low‐dimensional magnetism, spin glass, spin liquid, and spin ice ordering, among others.

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Measurement of the charge and current of magnetic monopoles in spin ice

Cited by 355 publications

References 26 publications

Controllable chirality-induced geometrical Hall effect in a frustrated highly correlated metal

Controllable chirality-induced geometrical Hall effect in a frustrated highly correlated metal

Molecular Em Fields and Dynamical Responses in Solids With Magnetic Charges

Magnetic Oxides

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