Journal
SCIENCE
Volume 326, Issue 5951, Pages 415-417Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1177582
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Funding
- Engineering and Physical Sciences Research Council
- Science and Technology Facilities Council
- Royal Society
- EPSRC [EP/C534654/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/C534654/1] Funding Source: researchfish
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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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