Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-02-15
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages and 12 figures main text + 10 pages and 1 figure supplementary material
Scientific paper
The heavy fermion compound URu2Si2 exhibits some of the most enigmatic manifestations of strongly correlated electronic matter. Cooling down to To=17.5K, reorders its ground state via a second order phase transition to an unidentified exotic order, the so called `hidden order' (HO), whose fingerprint is a large specific heat jump and a disproportionally small antiferromagnetic moment. Below 1.5K, the HO becomes superconducting, while it evolves to a large moment antiferromagnetic state (LMAF) upon raising pressure, through a first-order phase transition. A cascade of metamagnetic steps, an anomalous giant Nernst signal and a characteristic gapped spin excitation at Q=(1,0,0), add more mystery to the HO's identity. Here we provide for the first time, a unified understanding of the observed anomalous thermoelectricity, the unresolved metamagnetic behaviour and the existence of two distinct energy scales, demonstrating that the HO state is in fact a chiral dxy+idx2-y2 spin density wave state. The inelastic magnetic response at Q, is attributed to the emergence of a novel orbital antiferromagnetic collective mode, rotating the HO to the LMAF. Finally, we make specific predictions for a Polar Kerr experiment.
Aperis Alexandros
Kotetes Panagiotis
Varelogiannis Georgios
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