Effect of a staggered spin-orbit coupling on the occurrence of a nematic phase in Sr$ 3$Ru$ 2$O$ 7$ - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




Effect of a staggered spin-orbit coupling on the occurrence of a nematic phase in Sr$ 3$Ru$ 2$O$ 7$ - Condensed Matter > Strongly Correlated Electrons - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: Ultra-clean crystals of Sr$ 3$Ru$ 2$O$ 7$ undergo a metamagnetic transitionat low temperatures. This transition shows a strong anisotropy in the appliedfield direction with the critical field $H c$ ranging from $\sim 5.1$T for$H\perp c$ to $\sim 8$T for $H\parallel c$. In addition, studies on ultra-puresamples revealed a bifurcation of the metamagnetic line for fields in$c$-direction and it is argued that a nematic phase emerges between themagnetization jumps. The aim of this study is to explain the field-directionanisotropy of these phenomena. Based on a microscopic tight-binding model, weintroduce the metamagnetic transition by means of a van Hove singularityscenario. We show that the rotation of the O-octahedra around the c-axisexpected for this material introduces a staggered spin-orbit coupling withinthe planes and naturally leads to an anisotropy of the magnetic response. Wedescribe the low-temperature phase as a nematic state favored by forwardscattering processes. The spin-orbit coupling shows an influence on both, thecritical field $H c$ and the occurrence of the nematic phase.



Autor: Mark H. Fischer, Manfred Sigrist

Fuente: https://arxiv.org/







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