Structural, magnetic, transport, and thermoelectric properties of the pseudobrookite AlTi2 O5-Ti3 O5 system

Ryusei Takahama, Toi Ishii, Daigo Indo, Mitsutoshi Arizono, Chieko Terakura, Yoshinori Tokura, Nao Takeshita, Masaaki Noda, Hideki Kuwahara, Takuo Saiki, Takuro Katsufuji, Ryoichi Kajimoto, Tetsuji Okuda*

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We investigated the structural, magnetic, transport, and high-temperature thermoelectric properties of single crystals of the pseudobrookite Al1-xTi2+xO5 for 0≤x≤1 grown using a floating zone. We found a correlation of spin-singlet Ti3+-Ti3+ dimers coupled with the lattice even in the conductive α and λ phases which develops with increasing x. This developing dimer correlation reduces the number of unpaired Ti3+ ions, which makes the compound more conductive owing to the suppression of disorder for x up to about 0.75. The dimer fluctuation causes a critical enhancement of the magnetic susceptibility at around 150 K in the λ phase near the boundary (x∼0.9) between the λ and the β phases. Such a correlation of the spin-singlet Ti3+-Ti3+ dimers may produce a high Seebeck coefficient in the conductive α and λ phases leading to a large thermoelectric power factor at high temperatures.

本文言語English
論文番号074401
ジャーナルPhysical Review Materials
4
7
DOI
出版ステータスPublished - 2020 7

ASJC Scopus subject areas

  • 材料科学(全般)
  • 物理学および天文学(その他)

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