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Microscopic theory of the nematic phase in Sr3Ru2O7

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Zitation

Raghu, S., Paramekanti, A., Kim, E. A., Borzi, R. A., Grigera, S. A., Mackenzie, A. P., et al. (2009). Microscopic theory of the nematic phase in Sr3Ru2O7. Physical Review B, 79(21): 214402, pp. 1-10. doi:10.1103/PhysRevB.79.214402.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0018-F238-6
Zusammenfassung
In an externally applied magnetic field, ultrapure crystals of the bilayer compound Sr3Ru2O7 undergo a metamagnetic transition below a critical temperature, T-*, which varies as a function of the angle between the magnetic field H and the Ru-O planes. Moreover, T-* approaches zero when H is perpendicular to the planes. This putative "metamagnetic quantum critical point," however, is pre-empted by a nematic fluid phase with order one resistive anisotropy in the ab plane. In a "realistic" bilayer model with moderate strength local Coulomb interactions, the existence of a sharp divergence of the electronic density of states near a van Hove singularity of the quasi-one-dimensional bands, and the presence of spin-orbit coupling results in a mean-field phase diagram which accounts for many of these experimentally observed phenomena. Although the spin-orbit coupling is not overly strong, it destroys the otherwise near-perfect Fermi-surface nesting and hence suppresses spin-density-wave ordering.