期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 134, 期 4, 页码 2172-2179出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja2088426
关键词
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资金
- National High Magnetic Field Laboratory via the NSF [DMR-0654118]
- University Grant Commission, New Delhi
- Department of Science and Technology, Government of India, New Delhi
- [NSF-DMR-0701462]
Despite a long history of success in formation of transition-metal-doped quantum dots (QDs), the origin or magnetism in diluted magnetic semiconductors (DMSs) is yet a controversial issue. Cr(II)-doped II-VI DMSs are half-metallic, resulting in high-temperature ferromagnetism. The magnetic properties reflect a strong p-d exchange interaction between the spin-up Cr(II) t(2g) level and the Se 4p. In this study, ultrasmall (similar to 3.1 nm) Cr(II)-doped CdSe DMSQDs are shown to exhibit room-temperature ferromagnetism, as expected from theoretical arguments. Surprisingly, a low-temperature phase transition is observed at 20 K that is believed to reflect the onset of long-range ordering of the single-domain DMSQD.
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