Fragmentation in spin ice from magnetic charge injection.

Abstract:

:The complexity embedded in condensed matter fertilizes the discovery of new states of matter, enriched by ingredients like frustration. Illustrating examples in magnetic systems are Kitaev spin liquids, skyrmions phases, or spin ices. These unconventional ground states support exotic excitations, for example the magnetic charges in spin ices, also called monopoles. Here, we propose a mechanism to inject monopoles in a spin ice at equilibrium through a staggered magnetic field. We show theoretically, and demonstrate experimentally in the Ho2Ir2O7 pyrochlore iridate, that it results in the stabilization of a monopole crystal, which exhibits magnetic fragmentation. In this new state of matter, the magnetic moment fragments into an ordered part and a persistently fluctuating one. Compared to conventional spin ices, the different nature of the excitations in this fragmented state opens the way to tunable field-induced and dynamical behaviors.Exploring unconventional magnetism facilities both fundamental understanding of materials and their real applications. Here the authors demonstrate that a magnetic monopole crystal is stabilized by a staggered magnetic field in the pyrochlore iridate Ho2Ir2O7, leading to a fragmented magnetization.

journal_name

Nat Commun

journal_title

Nature communications

authors

Lefrançois E,Cathelin V,Lhotel E,Robert J,Lejay P,Colin CV,Canals B,Damay F,Ollivier J,Fåk B,Chapon LC,Ballou R,Simonet V

doi

10.1038/s41467-017-00277-1

subject

Has Abstract

pub_date

2017-08-08 00:00:00

pages

209

issue

1

issn

2041-1723

pii

10.1038/s41467-017-00277-1

journal_volume

8

pub_type

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