Ice rule correlations in stuffed spin ice

Spin correlations in Ho2Ti2O7: a dipolar spin ice system.

The pyrochlore material Ho2Ti2O7 has been suggested to show "spin ice" behavior. We present neutron scattering and specific heat results that establish unambiguously that Ho2Ti2O7 exhibits spin ice correlations at low temperature. Diffuse magnetic neutron scattering is quite well described by a nearest neighbor spin ice model and very accurately described by a dipolar spin ice model. The heat c...

Direct observation of the ice rule in an artificial kagome spin ice

Recently, significant interest has emerged in fabricated systems that mimic the behavior of geometrically frustrated materials. We present the full realization of such an artificial spin ice system on a two-dimensional kagome lattice and we demonstrate rigid adherence to the local ice rule by directly counting individual pseudospins. The resulting spin configurations show not only local ice rul...

Direct observation of the ice rule in demagnetized artificial kagome spin ice

Submitted for the MAR08 Meeting of The American Physical Society Direct observation of the ice rule in demagnetized artificial kagome spin ice YI QI, TODD BRINTLINGER, JOHN CUMINGS, Materials Science and Engineering, University of Maryland, College Park, PAULA MELLADO, OLEG TCHERNYSHYOV, Johns Hopkins University — Artificially designed magnetic structures have proven to be good analogs for the ...

Thermal quenches in spin ice.

We study the diffusion-annihilation process which occurs when spin ice is quenched from a high temperature paramagnetic phase deep into the spin-ice regime, where the excitations--magnetic monopoles--are sparse. We find that due to the Coulomb interaction between the monopoles, a dynamical arrest occurs, in which nonuniversal lattice-scale constraints impede the complete decay of charge fluctua...

Disorder and Quantum Spin Ice