Anomalous spin density distribution on oxygen and Ru in Ca${}_{1.5}$Sr${}_{0.5}$RuO${}_4$: A polarised neutron diffraction study

Abstract

By means of polarized neutron diffraction in a magnetic field of 7.0 T at 1.6 K an anomalously large magnetization density is observed on the in-plane oxygen in Ca${}_{1.5}$Sr${}_{0.5}$RuO${}_4$. Field-induced moments of different ions are determined by refinement on the flipping ratios, yielding $\mu$${}_{Ru}$ = 0.346(11) $\mu$${}_B$, ${\mu }_{O1}$ = 0.076(6) $\mu$${}_B$ and ${\mu }_{O2}$ = 0.009(6) $\mu$${}_B$. The moment on the oxygen arises from the strong hybridization between the Ru-4d and O-2p orbitals. %The maximum entropy method is used for the %reconstruction of the magnetization density and reveals a strongly anisotropic The maximum entropy magnetization density reconstruction reveals a strongly anisotropic density at the Ru site, consistent with the distribution of the {\it xy} ($t_{2g}$ band) {\it d}-orbitals.

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References in corpus (2)

• Magnetic Phase Diagram of Ca2-xSrxRuO4 Governed by Structural Distortions
• Incommensurate magnetic ordering in Sr_2Ru_(1-x)Ti_xO_4

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