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Magnetic Coulomb Phase in the Spin Ice Ho2Ti2O7

Fennell, T; Deen, PP; Wildes, AR; Schmalzl, K; Prabhakaran, D; Boothroyd, AT; Aldus, RJ; ... Bramwell, ST; + view all (2009) Magnetic Coulomb Phase in the Spin Ice Ho2Ti2O7. SCIENCE , 326 (5951) 415 - 417. 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.

Type: Article
Title: Magnetic Coulomb Phase in the Spin Ice Ho2Ti2O7
DOI: 10.1126/science.1177582
Keywords: FLUCTUATIONS, ENTROPY
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/133505
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