TY - JOUR
T1 - Growth and characterization of large (Y, La)TiO3 and (Y, Ca)TiO3 single crystals
AU - Hameed, S.
AU - Joe, J.
AU - Thoutam, Laxman Raju
AU - Garcia-Barriocanal, J.
AU - Yu, Biqiong
AU - Yu, G.
AU - Chi, S.
AU - Hong, T.
AU - Williams, T. J.
AU - Freeland, J. W.
AU - Gehring, P. M.
AU - Xu, Z.
AU - Matsuda, M.
AU - Jalan, B.
AU - Greven, M.
N1 - Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/12
Y1 - 2021/12
N2 - The Mott-insulating rare-earth titanates (RTiO3, with R being a rare-earth ion) are an important class of materials that encompasses interesting spin-orbital phases as well as 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, Y1-xLaxTiO3 (x≤0.25), and Y1-yCayTiO3 (y≤0.35) with the optical traveling-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.
AB - The Mott-insulating rare-earth titanates (RTiO3, with R being a rare-earth ion) are an important class of materials that encompasses interesting spin-orbital phases as well as 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, Y1-xLaxTiO3 (x≤0.25), and Y1-yCayTiO3 (y≤0.35) with the optical traveling-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.
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U2 - 10.1103/PhysRevMaterials.5.125003
DO - 10.1103/PhysRevMaterials.5.125003
M3 - Article
AN - SCOPUS:85122504173
SN - 2475-9953
VL - 5
JO - Physical Review Materials
JF - Physical Review Materials
IS - 12
M1 - 125003
ER -