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Dynamical fractal and anomalous noise in a clean magnetic crystal.

Accepted version
Peer-reviewed

Type

Article

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Authors

Abstract

Fractals-objects with noninteger dimensions-occur in manifold settings and length scales in nature. In this work, we identify an emergent dynamical fractal in a disorder-free, stoichiometric, and three-dimensional magnetic crystal in thermodynamic equilibrium. The phenomenon is born from constraints on the dynamics of the magnetic monopole excitations in spin ice, which restrict them to move on the fractal. This observation explains the anomalous exponent found in magnetic noise experiments in the spin ice compound Dy2Ti2O7, and it resolves a long-standing puzzle about its rapidly diverging relaxation time. The capacity of spin ice to exhibit such notable phenomena suggests that there will be further unexpected discoveries in the cooperative dynamics of even simple topological many-body systems.

Description

Keywords

51 Physical Sciences, 5103 Classical Physics

Journal Title

Science

Conference Name

Journal ISSN

0036-8075
1095-9203

Volume Title

378

Publisher

American Association for the Advancement of Science (AAAS)
Sponsorship
EPSRC (EP/T028580/1)
Engineering and Physical Sciences Research Council (EP/P034616/1)
Engineering and Physical Sciences Research Council (2275086)
EPSRC (EP/V062654/1)