2017年4月
Giant magnetoresistance of novel ferromagnets AMg(4)Mn(6)O(15) (A=K, Rb, and Cs) with highly symmetric structure
JOURNAL OF SOLID STATE CHEMISTRY
- ,
- 巻
- 248
- 号
- 開始ページ
- 150
- 終了ページ
- 156
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.jssc.2017.02.003
- 出版者・発行元
- ACADEMIC PRESS INC ELSEVIER SCIENCE
A novel family of cubic manganese oxides, AMg(4)Mn(6)O(15) (A=K, Rb, and Cs), were discovered. In this type of structure, the MnO6 octahedra share edges, constructing a highly symmetric framework where Mn atoms form a three-dimensional network of truncated octahedra. The crystallographic site of Mn is unique and the average oxidation state of Mn is 3.5, indicating a mixed-valence electronic state where Mn3+ and Mn4+ sites are completely indistinguishable. These compounds become ferromagnetic with fully polarized magnetic moments of Mn ions. The ferromagnetic transition temperature Tc is 170 K, that is considerably high for manganese oxides. The electric resistivity of KMg4Mn6O15 is about 10(5) Omega cm at 300 K and exhibits a non-metallic temperature dependence. It reveals a large negative magnetoresistance; about 40% of the resistivity is suppressed by 5 T of magnetic field at T-C.
- リンク情報
- ID情報
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- DOI : 10.1016/j.jssc.2017.02.003
- ISSN : 0022-4596
- eISSN : 1095-726X
- Web of Science ID : WOS:000396386300019