Valence Change of Yb in Transition Metal Oxides Ba3−xYbxTa5O15

Single crystals of Ba3−xYbxTa5O15 with a tetragonal tungsten bronze structure were grown using a floating-zone technique, and their transport and magnetic properties, optical spectra, and specific heat were measured. It was found that this series of compounds exhibits a valence change of Yb ions fro...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2024-10, Vol.93 (10), p.1
Main Authors: Takei, Haruki, Ito, Satomi, Katayama, Yumiko, Ueno, Kazunori, Kuwahara, Hideki, Katsufuji, Takuro
Format: Article
Language:eng ; jpn
Subjects:
Crystal growth
Low temperature
Magnetic properties
Magnetoresistance
Magnetoresistivity
Optical properties
Single crystals
Transition metal oxides
Tungsten bronze
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Summary:Single crystals of Ba3−xYbxTa5O15 with a tetragonal tungsten bronze structure were grown using a floating-zone technique, and their transport and magnetic properties, optical spectra, and specific heat were measured. It was found that this series of compounds exhibits a valence change of Yb ions from 2+ to 3+ with increasing x. This can be explained by assuming that the Yb2+ level exists immediately below the Fermi level in Ta 5d states, which decreases in energy with increasing x. It was also found that a positive magnetoresistance up to 3 T and a negative magnetoresistance above 3 T appear at low temperatures for x ≥ 1.0, indicating a peculiar state of Yb in this series of compounds.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.93.104703