Magnetic Coulomb phase in the spin ice Ho2Ti2O7.
basic_science · Level V
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- Record sourced from PubMed, PMID 19729619.
- Also identified by 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.