Photoinduced melting of a stripe-type charge-order and metallic domain formation in a layered BEDT-TTF-based organic salt
Photoinduced melting of a stripe-type charge-order and metallic domain formation in a layered BEDT-TTF-based organic salt
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DOI：
10.1103/physrevlett.98.097402
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发表时间：
2007-03-02
影响因子：
8.6
通讯作者：
Nishio, Y.
中科院分区：
文献类型：
--
作者：
Iwai, S.;Yamamoto, K.;Nishio, Y.
利用飞秒光谱研究了[双(乙烯二硫代)] - 四硫富瓦烯（BEDT - TTF）盐中电荷有序（CO）的光诱导熔化。对在电荷有序转变过程中呈现出大的[θ - (BEDT - TTF)₂RbZn(SCN)₄]和小的[α - (BEDT - TTF)₂I₃]分子重排的两种多型体进行了比较研究。两种化合物的电荷有序超快熔化都表明了由库仑相互作用引起的电子不稳定性的主要贡献。基于低频晶格动力学，讨论了分子重排对电荷有序和金属畴形成的作用。
Photoinduced melting of charge-order (CO) in [bis(ethylenedithiolo)]-tetrathiafulvalene (BEDT-TTF) salts was investigated by femotosecond spectroscopy. Comparative studies on two polytypes exhibiting large [theta-(BEDT-TTF)(2)RbZn(SCN)(4)] and small [alpha-(BEDT-TTF)(2)I-3] molecular rearrangements through the CO transition were performed. Ultrafast melting of CO for both compounds demonstrates the major contribution of the electronic instability which is due to Coulomb interaction. The roles of the molecular rearrangements on the formation of the CO and the metallic domain are discussed on the basis of low-frequency lattice dynamics.