# Orbital Properties of Sr3Ru2O7 and Related Ruthenates Probed by 17O-NMR Source: [Orbital Properties of Sr3Ru2O7 and Related Ruthenates Probed by 17O-NMR]() Collection index: [llms.txt]() Data updated: 2025-10-23T22:40:35.973Z Authors: K. Kitagawa, K. Ishida, R. S. Perry, H. Murakawa, K. Yoshimura, Y. Maeno Published: 2006-09-06T15:28:16.000Z ## Abstract We report a site-separated $^{17}$O-NMR study of the layered perovskite ruthenate Sr$\_3$Ru$\_2$O$\_7$, which exhibits nearly two-dimensional transport properties and itinerant metamagnetism at low temperatures. The local hole occupancies and the spin densities in the oxygen $2p$ orbitals are obtained by means of tight-binding analyses of electric field gradients and anisotropic Knight shifts. These quantities are compared with two other layered perovskite ruthenates: the two-dimensional paramagnet Sr$\_2$RuO$\_4$ and the three-dimensional ferromagnet SrRuO$\_3$. The hole occupancies at the oxygen sites are very large, about one hole per ruthenium atom. This is due to the strong covalent character of the Ru-O bonding in this compound. The magnitude of the hole occupancy might be related to the rotation or tilt of the RuO$\_6$ octahedra. The spin densities at the oxygen sites are also large, 20-40% of the bulk susceptibilities, but in contrast to the hole occupancies, the spin densities strongly depend on the dimensionality. This result suggests that the density-of-states at the oxygen sites plays an essential role for the understanding of the complex magnetism found in the layered perovskite ruthenates. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()