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Open AccessNuclear spin assisted quantum tunnelling of magnetic monopoles in spin ice
Extensive work on single molecule magnets has identified a fundamental mode of relaxation arising from the nuclear-spin assisted quantum tunnelling of nearly independent and quasi-classical magnetic dipoles. H...
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Open AccessPhase transitions in few-monolayer spin ice films
Vertex models are an important class of statistical mechanical system that admit exact solutions and exotic physics. Applications include water ice, ferro- and antiferro-electrics, spin ice and artificial spin...
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Article
Multiple Coulomb phase in the fluoride pyrochlore CsNiCrF6
The Coulomb phase is an idealized state of matter whose properties are determined by factors beyond conventional considerations of symmetry, including global topology, conservation laws and emergent order. The...
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Open AccessSpecial temperatures in frustrated ferromagnets
The description and detection of unconventional magnetic states, such as spin liquids, is a recurring topic in condensed matter physics. While much of the efforts have traditionally been directed at geometrica...
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Experimental signature of the attractive Coulomb force between positive and negative magnetic monopoles in spin ice
A magnetic analogue of the Poole–Frenkel effect shows that magnetic monopole quasiparticles in a spin ice behave similar to electrons in a semiconductor, with an attractive Coulomb force acting between positiv...
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Open AccessRestoration of the third law in spin ice thin films
A characteristic feature of spin ice is its apparent violation of the third law of thermodynamics. This leads to a number of interesting properties including the emergence of an effective vacuum for magnetic m...
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Far-from-equilibrium monopole dynamics in spin ice
Magnetic monopoles can exist in frustrated magnetic systems known as spin ices. The study of these exotic objects is challenging, but a technique that uses the quench parameters to control the number of monopo...
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Article
Onsager’s Wien effect on a lattice
The nonlinear response of a weak electrolyte to an applied electric field is known as the Wien effect. This is now simulated on a lattice Coulomb gas, therefore providing a platform for investigating system-sp...
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Open AccessBrownian motion and quantum dynamics of magnetic monopoles in spin ice
Spin ice illustrates many unusual magnetic properties, including zero point entropy, emergent monopoles and a quasi liquid–gas transition. To reveal the quantum spin dynamics that underpin these phenomena is a...
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Open AccessHigh pressure route to generate magnetic monopole dimers in spin ice
The gas of magnetic monopoles in spin ice is governed by one key parameter: the monopole chemical potential. A significant variation of this parameter could access hitherto undiscovered magnetic phenomena aris...
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Creation and measurement of long-lived magnetic monopole currents in spin ice
The recent discovery of ‘magnetricity’ in spin ice raises the question of whether long-lived currents of magnetic ‘monopoles’ can be created and manipulated by applying magnetic fields. Here we show that they ...
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Measurement of the charge and current of magnetic monopoles in spin ice
Electric charges and currents are ubiquitous, but their magnetic counterparts are elusive. With the recent prediction, then demonstration, of the existence of magnetic 'monopoles' — particles with a net magnet...
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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 principles. In ...
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Field-induced partial order in the spin ice dysprosium titanate
Neutron scattering has been used to investigate the magnetic correlations in the spin-ice material dysprosium titanate, Dy2Ti2O7. An isotopically enriched sample was used to minimise neutron absorption. In zero f...
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Pressure-induced crystallization of a spin liquid
Liquids are expected to crystallize at low temperature. The only exception is helium, which can remain liquid at 0 K, owing to quantum fluctuations1,2. Similarly, the atomic magnetic moments (spins) in a magnet a...
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Universality of rare fluctuations in turbulence and critical phenomena
A statistical treatment of three-dimensional turbulent flow continues to pose a challenge to theorists1,2. One suggestion invokes an analogy with equilibrium phase transitions3. Here we approach this idea experim...
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Ion exchange reactions of KNiAsO4
The mica-like layer compound KNiAsO4 easily exchanges its interlayer potassium ions for alkyl ammonium ions, RNH 3 + (R=CH3 - C18H37). Short chain ions (<C4) wi...
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Magnetic susceptibility study of KNiAsO4, HMnAsO4·H2O and their organic-intercalated derivatives
The layer compounds KNiAsO4 and krautite, HMnAsO4·H2O are found to be antiferromagnetic, ordering at 19.2 K and 3.2 K respectively. The behaviour of their derivatives C10H21NH3NiAsO4 and CH3NH3MnAsO4·H2O indicate...
