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Title: Orbital ordering near a Mott transition: Resonant x-ray scattering study of the perovskite Ti oxides RTiO{sub 3} and LaTiO{sub 3.02} (R=Gd, Sm, Nd, and La)

Abstract

We investigated orbital ordering states in the vicinity of the Mott transition in RTiO{sub 3} and LaTiO{sub 3.02} (R=Gd,Sm,Nd,La) using resonant x-ray scattering (RXS) at the 1s{yields}3d transition energy of the K absorption edge of Ti. We measured the energy and azimuthal angle dependences of the resonant signal at the reflections of Q=(1 0 0) (0 1 1), and (0 0 1). The RXS intensity gradually decreased with decreasing the GdFeO{sub 3}-type distortion. Although there is a magnetic phase boundary between GdTiO{sub 3} (ferromagnet) and SmTiO{sub 3} (antiferromagnet), the ratio among the magnitudes at those reflections was almost the same. The azimuthal angle dependence also showed an identical periodicity at each scattering vector. With further decreasing the GdFeO{sub 3}-type distortion, the magnitude of the RXS in LaTiO{sub 3} became small and almost isotropic. This means that the orbital state of LaTiO{sub 3} is different from those of RTiO{sub 3} (R=Y,Gd,Sm). Furthermore, when we approached the Mott transition by hole doping, the signal of the RXS disappeared in LaTiO{sub 3.02}, which is just located on the metal-insulator boundary. This indicates a disappearance of the orbital ordering at the Mott transition.

Authors:
; ; ; ; ;  [1]
  1. Photon, Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801 (Japan)
Publication Date:
OSTI Identifier:
20662291
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 70; Journal Issue: 24; Other Information: DOI: 10.1103/PhysRevB.70.245125; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETIC MATERIALS; CRYSTAL STRUCTURE; ELECTRON CORRELATION; FERROMAGNETIC MATERIALS; GADOLINIUM COMPOUNDS; K ABSORPTION; L-S COUPLING; LANTHANUM COMPOUNDS; NEODYMIUM COMPOUNDS; OXIDES; PEROVSKITE; SAMARIUM COMPOUNDS; TITANATES; X-RAY DIFFRACTION

Citation Formats

Kubota, M, Nakao, H, Murakami, Y, Taguchi, Y, Iwama, M, Tokura, Y, Photon, Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Japan and Core Research for Evolutional Science and Technology, Photon, Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Core Research for Evolutional Science and Technology, Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, and Correlated Electron Research Center. Orbital ordering near a Mott transition: Resonant x-ray scattering study of the perovskite Ti oxides RTiO{sub 3} and LaTiO{sub 3.02} (R=Gd, Sm, Nd, and La). United States: N. p., 2004. Web. doi:10.1103/PhysRevB.70.245125.
Kubota, M, Nakao, H, Murakami, Y, Taguchi, Y, Iwama, M, Tokura, Y, Photon, Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Japan and Core Research for Evolutional Science and Technology, Photon, Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Core Research for Evolutional Science and Technology, Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, & Correlated Electron Research Center. Orbital ordering near a Mott transition: Resonant x-ray scattering study of the perovskite Ti oxides RTiO{sub 3} and LaTiO{sub 3.02} (R=Gd, Sm, Nd, and La). United States. https://doi.org/10.1103/PhysRevB.70.245125
Kubota, M, Nakao, H, Murakami, Y, Taguchi, Y, Iwama, M, Tokura, Y, Photon, Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Japan and Core Research for Evolutional Science and Technology, Photon, Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Core Research for Evolutional Science and Technology, Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, and Correlated Electron Research Center. Wed . "Orbital ordering near a Mott transition: Resonant x-ray scattering study of the perovskite Ti oxides RTiO{sub 3} and LaTiO{sub 3.02} (R=Gd, Sm, Nd, and La)". United States. https://doi.org/10.1103/PhysRevB.70.245125.
@article{osti_20662291,
title = {Orbital ordering near a Mott transition: Resonant x-ray scattering study of the perovskite Ti oxides RTiO{sub 3} and LaTiO{sub 3.02} (R=Gd, Sm, Nd, and La)},
author = {Kubota, M and Nakao, H and Murakami, Y and Taguchi, Y and Iwama, M and Tokura, Y and Photon, Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Japan and Core Research for Evolutional Science and Technology and Photon, Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801 and Core Research for Evolutional Science and Technology and Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute and Department of Applied Physics, University of Tokyo, Tokyo 113-8656 and Department of Applied Physics, University of Tokyo, Tokyo 113-8656 and Correlated Electron Research Center},
abstractNote = {We investigated orbital ordering states in the vicinity of the Mott transition in RTiO{sub 3} and LaTiO{sub 3.02} (R=Gd,Sm,Nd,La) using resonant x-ray scattering (RXS) at the 1s{yields}3d transition energy of the K absorption edge of Ti. We measured the energy and azimuthal angle dependences of the resonant signal at the reflections of Q=(1 0 0) (0 1 1), and (0 0 1). The RXS intensity gradually decreased with decreasing the GdFeO{sub 3}-type distortion. Although there is a magnetic phase boundary between GdTiO{sub 3} (ferromagnet) and SmTiO{sub 3} (antiferromagnet), the ratio among the magnitudes at those reflections was almost the same. The azimuthal angle dependence also showed an identical periodicity at each scattering vector. With further decreasing the GdFeO{sub 3}-type distortion, the magnitude of the RXS in LaTiO{sub 3} became small and almost isotropic. This means that the orbital state of LaTiO{sub 3} is different from those of RTiO{sub 3} (R=Y,Gd,Sm). Furthermore, when we approached the Mott transition by hole doping, the signal of the RXS disappeared in LaTiO{sub 3.02}, which is just located on the metal-insulator boundary. This indicates a disappearance of the orbital ordering at the Mott transition.},
doi = {10.1103/PhysRevB.70.245125},
url = {https://www.osti.gov/biblio/20662291}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 24,
volume = 70,
place = {United States},
year = {2004},
month = {12}
}