Thermal Conductivity and Specific Heat of the Spin-Ice Compound Dy2Ti2O7: Experimental Evidence for Monopole Heat Transport
Abstract
Elementary excitations in the spin-ice compound Dy2Ti2O7 can be described as magnetic monopoles propagating independently within the pyrochlore lattice formed by magnetic Dy ions. We studied the magnetic-field dependence of the thermal conductivity (B) for B || [001] and observe clear evidence for magnetic heat transport originating from the monopole excitations. The magnetic contribution mag is strongly field-dependent and correlates with the magnetization M(B). The diffusion coefficient obtained from the ratio of mag and the magnetic specific heat is strongly enhanced below 1 K indicating a high mobility of the monopole excitations in the spin-ice state.
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