Report

Magnetic Coulomb Phase in the Spin Ice Ho2Ti2O7

Science  16 Oct 2009:
Vol. 326, Issue 5951, pp. 415-417
DOI: 10.1126/science.1177582

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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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