表題番号：2015B-296
日付：2016/04/05
研究課題4d遷移金属酸化物における新奇磁気緩和現象とその応用
| 研究者所属（当時） | 資格 | 氏名 | |
|---|---|---|---|
| （代表者） | 理工学術院 先進理工学部 | 教授 | 勝藤 拓郎 |
- 研究成果概要
- La5Mo4O16 has tetragonal lattices of Mo ions with a checkerboard arrangement of Mo4+ and Mo5+, and exhibits ferrimagnetic ordering of Mo4+ and Mo5+ moments within the tetragonal plane and the antiferromagnetic arrangement of the ferrimagnetic moment along the c axis (perpendicular to the plane) below 200 K. We grew the single crystals of this compound by the floating-zone technique and measured the magnetization and resistivity with applied magnetic field. We found new anomalies at 90 K and 70 K in the temperature dependence of both magnetization and resistivity, in addition to the ferrimagnetic ordering at 200 K. We also found a multiple step-like behavior in the field-dependence of magnetization (M(H) curve) and an anomalous relaxation behavior of the magnetization below 70 K. We also found positive magnetoresistance and its relaxation behavior, which is closely correlated with the magnetic relaxation.