| The description of magnetic moments in spin ice in terms of freely moving magnetic monopoles has added a new dimension to the concept of fractionalization, showing that geometrical frustration in parallel with a flat, or low energy bad of states can drive the emergence of quasi-particles of reduced dimension. Here we show how the condensation of monopoles into a crystallized state collectively fractionalizes the field of magnetic moments into two distinct parts. The symmetry breaking separates the field of moments giving a phase with antiferromagnetic order in a decoupled background of flat band fluctuations characteristic of a Coulomb phase. Although this is a model system, we will discuss the experimental consequences of the observed behaviour. |
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