Dirac Strings and Magnetic Monopoles in Spin Ice Dy2Ti2O7

Details Dirac Strings and Magnetic Monopoles in Spin Ice Dy2Ti2O7 Dirac Strings and Magnetic Monopoles in Spin Ice Dy2Ti2O7

2010-11-04

arxiv.org/abs/1011.1174v1

Science 326, 411-414 (2009)

Physics

Condensed Matter

Materials Science

32 pages (19 pages of article, 13 pages of supporting online material)

Scientific paper

10.1126/science.1178868

While sources of magnetic fields - magnetic monopoles - have so far proven elusive as elementary particles, several scenarios have been proposed recently in condensed matter physics of emergent quasiparticles resembling monopoles. A particularly simple proposition pertains to spin ice on the highly frustrated pyrochlore lattice. The spin ice state is argued to be well-described by networks of aligned dipoles resembling solenoidal tubes - classical, and observable, versions of a Dirac string. Where these tubes end, the resulting defect looks like a magnetic monopole. We demonstrate, by diffuse neutron scattering, the presence of such strings in the spin-ice Dy2Ti2O7. This is achieved by applying a symmetry-breaking magnetic field with which we can manipulate density and orientation of the strings. In turn, heat capacity is described by a gas of magnetic monopoles interacting via a magnetic Coulomb interaction.

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