Science. 2009 Oct 16;326(5951):415-7. Epub 2009 Sep 3.

Magnetic Coulomb phase in the spin ice Ho2Ti2O7.

Fennell T, Deen PP, Wildes AR, Schmalzl K, Prabhakaran D, Boothroyd AT, Aldus RJ, McMorrow DF, Bramwell ST.

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Institut Laue-Langevin, Grenoble 38042, France. fennell@ill.fr

Abstract

Spin-ice materials are magnetic substances in which the spin directions map onto hydrogen positions in water ice. Their low-temperature magnetic state has been predicted to be a phase that obeys a Gauss' law and supports magnetic monopole excitations: in short, a Coulomb phase. We used polarized neutron scattering to show that the spin-ice material Ho2Ti2O7 exhibits an almost perfect Coulomb phase. Our result proves the existence of such phases in magnetic materials and strongly supports the magnetic monopole theory of spin ice.

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Science. 2009 Oct 16;326(5951):375-6.

PMID:: 19729619; [PubMed]

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