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Journal ArticleDOI

An Investigation of the Magnetic Properties of Sm1−xTiO3forx=0.03, 0.05, and 0.10: Magnetic Structure Determination of Sm0.97TiO3by Short-Wavelength Neutron Diffraction on Single Crystals☆

15 Nov 1998-Journal of Solid State Chemistry (Academic Press)-Vol. 141, Iss: 1, pp 262-269
TL;DR: In this paper, the magnetic moments are estimated to be 0.72 (1) and 0.43(1)μBon on the Ti(III and Sm(III) sublattices, respectively.
About: This article is published in Journal of Solid State Chemistry.The article was published on 1998-11-15. It has received 22 citations till now. The article focuses on the topics: Paramagnetism & Magnetic susceptibility.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a strong structural anomaly near the antiferromagnetic ordering was found, which implies a splitting of the 2g level of the LaTiO lattice, where the structural distortion and the resulting level splitting are enhanced by the magnetic ordering.
Abstract: The crystal and magnetic structures of ${\mathrm{LaTiO}}_{3}$ have been studied by x-ray and neutron-diffraction techniques using nearly stoichiometric samples. We find a strong structural anomaly near the antiferromagnetic ordering ${T}_{N}=146\mathrm{K}.$ In addition, the octahedra in ${\mathrm{LaTiO}}_{3}$ exhibit an intrinsic distortion, which implies a splitting of the ${t}_{2g}$ levels. Our results indicate that ${\mathrm{LaTiO}}_{3}$ should be considered as a Jahn-Teller system where the structural distortion and the resulting level splitting are enhanced by the magnetic ordering.

140 citations

Journal ArticleDOI
TL;DR: In this article, a review of the state of the art on the studies for understanding physics contained in the properties of the perovskite titanates is presented, which allows the single-band descriptions of the ground-state and the low-energy electronic structures as a good starting point.
Abstract: Titanate compounds have been recognized as key materials for understanding the coupling of magnetism and orbitals in strongly correlated electron systems. In the perovskite Ti oxide RTiO3 (where R represents the trivalent rare-earth ions), which is a typical Mott?Hubbard insulator, the Ti t2g orbitals and spins in the 3d1 state couple each other through the strong electron correlations, resulting in a rich variety of orbital?spin phases. One way of controlling the coupling is to change the tiltings of the TiO6 octahedra (namely the GdFeO3-type distortion) by varying the R ions, through which the relative ratio of the electron bandwidth to the Coulomb interaction is controlled. With this control, these Mott insulators exhibit an antiferromagnetic-to-ferromagnetic (AFM?FM) phase transition, which has turned out to be a consequence of rich orbital physics in these materials. The origin and nature of orbital?spin structures of these Mott insulators have been intensively studied both experimentally and theoretically. When the Mott insulators are doped with carriers, the titanates show touchstone properties of the filling controlled Mott transition. In this paper, we first review the state of the art on the studies for understanding physics contained in the properties of the perovskite titanates. On the properties of the insulators, we focus on the following three topics: (1) the origin and nature of the ferromagnetism as well as the orbital ordering in the compounds with relatively small R ions such as GdTiO3 and YTiO3, (2) the origin of the G-type antiferromagnetism and the orbital state in LaTiO3 and (3) the orbital?spin structures in other AFM(G) compounds with relatively large R ions (R = Ce, Pr, Nd and Sm). On the basis of these discussions, we discuss the whole phase diagram together with mechanisms of the magnetic phase transition. On the basis of the microscopic understanding of the orbital?spin states, we show that the Ti t2g degeneracy is inherently lifted in the titanates, which allows the single-band descriptions of the ground-state and the low-energy electronic structures as a good starting point. Our analyses indicate that these compounds offer good touchstone materials described by the single-band Hubbard model on the cubic lattice. From this insight, we also re-analyse the hole-doped titanates TiO3 (where A represents the divalent alkaline-earth ions). Experimentally revealed filling- and bandwidth-dependent properties and the critical behaviour of the metal?insulator transitions are discussed in the light of theories based on the single-band Hubbard models.

112 citations

Journal ArticleDOI
TL;DR: The interplay between non-collinear magnetism and ferroelectric and antiferrodistortive distortions of the perovskite structure, and how this can promote magnetoelectric responses is discussed.
Abstract: We present an overview of the current interest in non-collinear magnetism in multiferroic perovskite crystals. We first describe the different microscopic mechanisms giving rise to the non-collinearity of spins in this class of materials. We discuss, in particular, the interplay between non-collinear magnetism and ferroelectric and antiferrodistortive distortions of the perovskite structure, and how this can promote magnetoelectric responses. We then provide a literature survey on non-collinear multiferroic perovskites. We discuss numerous examples of spin cantings driving weak ferromagnetism in transition metal perovskites, and of spin-induced ferroelectricity as observed in the rare-earth based perovskites. These examples are chosen to best illustrate the fundamental role of non-collinear magnetism in the design of multiferroicity.

106 citations

Journal ArticleDOI
TL;DR: The double perovskite Ba2MnWO6 has been prepared as a pure powder by a conventional solid-state reaction process and studied by X-ray, neutron powder diffraction (NPD), magnetization, and AC susceptibility measurements as discussed by the authors.

53 citations

Journal ArticleDOI
TL;DR: In this article, the nuclear and magnetic properties of the double perovskite Sr2MnWO6 have been studied using neutron powder diffraction (NPD) data.

49 citations

References
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Book
01 Jan 1967

801 citations

Journal ArticleDOI
TL;DR: In this article, a method of using a priori information, extracted from the strongest peaks, to obtain statistically optimum results has been developed at the Institut Laue-Langevin (ILL), Grenoble.
Abstract: The development of multidetectors for use in X-ray and neutron scattering experiments has created an interest in methods for integrating Bragg peaks in three-dimensional data arrays representing intensity scattered from single crystals. A method of using a priori information, extracted from the strongest peaks, to obtain statistically optimum results has been developed at the Institut Laue–Langevin (ILL), Grenoble. The method is outlined in this paper and results of its application to neutron diffraction are discussed.

207 citations

21 Apr 1983
TL;DR: The Sixteenth Rare Earth Research Conferences was held April 18-21, 1983, on the campus of Florida State University in Tallahassee, FL. Over 190 lectures and posters were presented during the conference on a wide variety of topics in rare earth science and technology as mentioned in this paper.
Abstract: : The Sixteenth Rare Earth Research Conferences was held April 18-21, 1983, on the campus of Florida State University in Tallahassee, FL. Over 190 lectures and posters were presented during the conference on a wide variety of topics in rare earth science and technology. The oral presentations were organized into nine mini-symposia which opened with a keynote lecturer and consisted exclusively of invited speakers. The topics covered were as follows: comparison of lanthanide-actinide chemistry and physics; surface spectroscopy of lanthanides; lanthanide organometallic chemistry; magnetic superconductors and spin glasses; lanthanide bioinorganic chemistry; crystal fields and spectroscopy; industrial applications of the rare earths; lanthanide-transition metal intermetallics and hydrides; inorganic structures-low valent compounds; structure-property relationships.

171 citations

Journal ArticleDOI
TL;DR: In this article, the structures of the RE TiO 3 perovskites, RE = La, Nd, Sm, Gd, and Y, were solved using single-crystal, automated diffractometer techniques.

167 citations