Impurity-induced transition to a Mott insulator in Sr${}_3$Ru${}_2$O${}_7$

Abstract

The electrical, magnetic, and structural properties of Sr${}_3$(Ru${}_{1-x}$Mn${}_x$)${}_2$O${}_7$ (0 $\le x\le$ 0.2) are investigated. The parent compound Sr${}_3$Ru${}_2$O${}_7$ is a paramagnetic metal, critically close to magnetic order. We have found that, with a Ru-site doping by only a few percent of Mn, the ground state is switched from a paramagnetic metal to an antiferromagnetic insulator. Optical conductivity measurements show the opening of a gap as large as 0.1 eV, indicating that the metal-to-insulator transition is driven by the electron correlation. The complex low-temperature antiferromagnetic spin arrangement, reminiscent of those observed in some nickelates and manganites, suggests a long range orbital order.

arXiv commentREVTeX 4 style; 5 pages, 4 figures

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Cited by in corpus (16)

• Structural transitions, octahedral rotations, and electronic properties of $A_3$Ni${}_2$O${}_7$ rare-earth nickelates under high pressure
• Local Tunneling Spectroscopy across a Metamagnetic Critical Point in the Bi-layer Ruthenate Sr3Ru2O7
• Structural and physical properties of $SrM{n}_{1-x}R{u}_x{O}_3$ perovskites
• Crystal-field level inversion in lightly Mn-doped Sr3Ru2O7
• Evolution of Structural and Physical Properties of Sr3(Ru1-xMnx)2O7 with Mn Concentration
• Topological Gapless Phases in Non-Symmorphic Antiferromagnets
• Half-metallic ferromagnetism in Sr${}_3$Ru${}_2$O${}_7$
• Mott versus Slater-type metal-insulator transition in Mn-substituted Sr3Ru2O7
• Doping and dimensionality effects on the core-level spectra of layered ruthenates
• Electronic superlattice revealed by resonant scattering from random impurities in Sr3Ru2O7
• Emergent charge order near the doping-induced Mott-insulating quantum phase transition in Sr${}_3$Ru${}_2$O${}_7$
• Depth dependence of itinerant character in Mn-substituted Sr3Ru2O7
• Competing magnetic orders in quantum critical Sr${}_3$Ru${}_2$O${}_7$
• Tipping the magnetic instability in paramagnetic Sr${}_3$Ru${}_2$O${}_7$ by Fe impurities
• Structural and magnetic field effects on spin fluctuations in Sr${}_3$Ru${}_2$O${}_7$
• Mn-induced magnetic symmetry breaking and its correlation with the metal-insulator transition in bilayered Sr3(Ru1-xMnx)2O7