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Growth and Characterization of Large (Y,La)TiO3 and (Y,Ca)TiO3 Single Crystals

Published

Author(s)

Sajna Hameed, Joseph Joe, Laxman Thoutam, Javier Garcia Barriocanal, Biqiong Yu, Guichuan Yu, S. Chi, Tao Hong, Travis Williams, John W. Freeland, Peter M. Gehring, Zhijun Xu, Masaaki Matsuda, Bharat Jalan, Martin Greven

Abstract

The Mott-insulating rare-earth titanates (RTiO3, R being a rare-earth ion) are an important class of materials that encompasses interesting spin-orbital phases, ferromagnet-antiferromagnet and insulator-metal transitions. The growth of these materials has been plagued by difficulties related to overoxidation, which arises from a strong tendency of Ti3+ to oxidize to Ti4+. We describe our efforts to grow sizable single crystals of YTiO3 and its La-substituted and Ca-doped variants, using the optical travelling-solvent floating-zone technique. We present sample characterization via chemical composition analysis, magnetometry, charge transport, neutron scattering, x-ray absorption spectroscopy and x-ray magnetic circular dichroism to understand macroscopic physical property variations associated with overoxidation. Furthermore, we demonstrate a good signal-to-noise ratio in inelastic magnetic neutron scattering measurements of spin-wave excitations. A superconducting impurity phase, found to appear in Ca-doped samples at high doping levels, is identified as TiO.
Citation
Physical Review Materials
Volume
5
Issue
12

Keywords

Rare-earth titanates, crystal growth, Mott insulator, Metal-insulator transition, x-ray absorption fine structure, neutron scattering

Citation

Hameed, S. , Joe, J. , Thoutam, L. , Garcia Barriocanal, J. , Yu, B. , Yu, G. , Chi, S. , Hong, T. , Williams, T. , Freeland, J. , Gehring, P. , Xu, Z. , Matsuda, M. , Jalan, B. and Greven, M. (2021), Growth and Characterization of Large (Y,La)TiO<sub>3</sub> and (Y,Ca)TiO<sub>3</sub> Single Crystals, Physical Review Materials, [online], https://doi.org/10.1103/PhysRevMaterials.5.125003, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932924 (Accessed May 27, 2024)

Issues

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Created December 29, 2021, Updated March 15, 2024