期刊
PHYSICAL REVIEW B
卷 79, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.214402
关键词
electronic density of states; Fermi surface; magnetic field effects; metamagnetism; phase diagrams; spin density waves; spin-orbit interactions; strontium compounds
资金
- EPSRC [EP/F044704/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F044704/1, EP/C511778/1] Funding Source: researchfish
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.
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