Effects of Localized Spins in Quasi-Two Dimensional Organic Conductors
Effects of Localized Spins in Quasi-Two Dimensional Organic Conductors
复制标题
准二维有机导体中局域自旋的影响
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
H. Fukuyama
中科院分区：
文献类型：
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作者：
C. Hotta;H. Fukuyama
Theoretical study on the effect of high Fe spin S =5/2 on the organic two-dimensional electronic system of BETS compounds is made by the calculation with the mean-field approximation for the Coulomb interaction. It turned out that a relatively smaller value of on-site Coulomb interaction, U = U BETS , on BETS sites compared with that of ET makes the nature of ground states sensitive to the band structure which are characterized by two different types of molecular arrangement, λ- and κ-type. The λ-type system with a smaller band overlap shows a Mott-like insulating state, while the large band overlap of the κ-type favors a nobel spin density wave (SDW)-like state newly found in our study. In both states, the spin amplitude is increased by the exchange interaction, J , between Fe spins and BETS electrons. Our results are summarized in the unified phase diagram, where at a fixed value value of U BETS close to the metal-insulator boundary, even a small value of J as well as the difference in the band structur...
