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高濱 隆成*; 有薗 実駿*; 犬童 代梧*; 吉永 汰正*; 寺倉 千恵子*; 竹下 直*; 白崎 巧*; 野田 正亮*; 桑原 英樹*; 梶本 亮一; et al.
JPS Conference Proceedings (Internet), 38, p.011114_1 - 011114_6, 2023/05
We investigated the transport and magnetic properties of single crystals of the pseudobrookite AlTi
O
for
grown using a floating zone. We found a correlation of spin-singlet Ti
-Ti
dimers even in the conductive
and
phases which develops with increasing
. The development of the dimer correlation suppresses the magnetic susceptibility at the low temperature and enhances the electric conductivity perhaps due to the suppression of the magnetic scattering at the isolated Ti
ions. The compound shows the best conductivity in the
phase near the phase boundary between the
and
phases where the dimer correlation is much developed. Some exotic conductive state may be realized under the background of fluctuation of the spin-singlet dimer in the
phase near the phase boudary.
高濱 隆成*; 石井 透依*; 犬童 代梧*; 有薗 実駿*; 寺倉 千恵子*; 十倉 好紀*; 竹下 直*; 野田 正亮*; 桑原 英樹*; 斎木 琢夫*; et al.
Physical Review Materials (Internet), 4(7), p.074401_1 - 074401_11, 2020/07
被引用回数:10 パーセンタイル:46.35(Materials Science, Multidisciplinary)We investigated the structural, magnetic, transport, and high-temperature thermoelectric properties of single crystals of the pseudobrookite AlTi
O
for
grown using a floating zone. We found a correlation of spin-singlet Ti
-Ti
dimers coupled with the lattice even in the conductive
and
phases which develops with increasing
. This developing dimer correlation reduces the number of unpaired Ti
ions, which makes the compound more conductive owing to the suppression of disorder for
up to about 0.75. The dimer fluctuation causes a critical enhancement of the magnetic susceptibility at around 150 K in the
phase near the boundary (
) between the
and the
phases. Such a correlation of the spin-singlet Ti
-Ti
dimers may produce a high Seebeck coefficient in the conductive
and
phases leading to a large thermoelectric power factor at high temperatures.