| Project/Area Number |
05452046
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
NOZUE Yasuo Faculty or Science, Tohoku University Research Physicist, 理学部, 助手 (60125630)
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| Co-Investigator(Kenkyū-buntansha) |
KAYANUMA Yosuke Faculty or Science, Tohoku University Associate Professor, 理学部, 助教授 (80124569)
TERASAKI Osamu Faculty or Science, Tohoku University Associate Professor, 理学部, 助教授 (30004401)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥7,100,000 (Direct Cost: ¥7,100,000)
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| Keywords | Ferromagnetism / Cluster / Zeolite / Alkali Metals |
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| Research Abstract |
Arrayd alkali-metal-clusters are generated in zeolite LTA crystals, and following results are obtained.
(1) A ferromagnetism appears at the average electron density of 5 per K-cluster. The reason why the ferromagnetism occurs without any magnetic component is as follows. When the second lowest electronic state of cluster is half occupied with electrons, the cluster has the maximum magnetic moment due to the Hund coupling. If these magnetic moments have a common orientation due to the intercluster interaction, a ferromagnetism occurs at lower temperatures.
(2) A similar ferromagnetism is observed in Rb clusters, but the ferromagnetism is weaker than that in K-clusters. The weakness of ferromagnetism is assigned to the larger itinerancy of selectrons than that in K-clusters.
(3) A diamagnetism was observed in Na-clusters. In Na-clusters, electrons may have the singlet statet which is stabilized by the electron-phonon interaction.
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