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Spin-ice materials are insulating materials where spins form a 3D pyrochlore lattice and have a frustrated magnetic interaction. The spin dynamics in most spin-ice materials is very classical and has little quantum fluctuations. So the question is that which spin-ice materials have strong quantum fluctuations? What are the model Hamiltonian for the spins in those materials? Any interesting experimental results on those materials?

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If spin-ice materials had very strong quantum fluctuations, they would not be able to order as spin-ice at all; fluctuations would melt the system into a spin liquid.

But there is one recent reference that covers all of your questions: http://prx.aps.org/abstract/PRX/v1/i2/e021002

They report theory work (providing the model hamiltonian you asked for) and neutron scattering data to describe the strongly fluctuating rare-earth pyrochlore Yb$_2$Ti$_2$O$_7$.

In the context of the original question by PI-CMT, and in relation to the answer regarding Yb$_2$Ti$_2$O$_7$, one might find the following talk on the PI talk archive of some use: http://pirsa.org/index.php?p=speaker&name=Rajiv_R.P._Singh posted on June 15 2012.

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