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Abstract: Magnetic monopoles have eluded experimental detection since their predictionnearly a century ago by Dirac. Recently it has been shown that classicalanalogues of these enigmatic particles occur as excitations out of thetopological ground state of a model magnetic system, dipolar spin ice. Thesequasi-particle excitations do not require a modification of Maxwell-sequations, but they do interact via Coulombs law and are of magnetic origin. Inthis paper we present an experimentally measurable signature of monopoledynamics and show that magnetic relaxation measurements in the spin icematerial $Dy {2}Ti {2}O {7}$ can be interpreted entirely in terms of thediffusive motion of monopoles in the grand canonical ensemble, constrained by anetwork of -Dirac strings- filling the quasi-particle vacuum. In a magneticfield the topology of the network prevents charge flow in the steady state, butthere is a monopole density gradient near the surface of an open system.



Author: Ludovic D. C. Jaubert Phys-ENS, Peter C. W. Holdsworth Phys-ENS

Source: https://arxiv.org/



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