2-STEP NEUTRAL-IONIC PHASE-TRANSITION IN ORGANIC CHARGE-TRANSFER COMPOUNDS - POSSIBLE STAGING EFFECT

被引：33

作者：

IWASA, Y ^{[1
]}

WATANABE, N ^{[1
]}

KODA, T ^{[1
]}

SAITO, G ^{[1
]}

机构：

[1] KYOTO UNIV,DEPT CHEM,KYOTO 606,JAPAN

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.47.2920

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A two-step neutral-ionic transition has been discovered in a 1:1 mixed-stack charge-transfer crystal, (3,3',5,5') tetramethylbenzidine-(7,7,8,8) tetracyanoquinodimethane (TMB-TCNQ) under pressure. The fraction of ionized molecules changes discontinuously at two critical pressures, P1 approximately 6 and P2 approximately 20 kbar, demonstrating a characteristic feature of a staging phenomena. This result is interpreted in terms of a frustration effect of Coulomb interactions in the crystal, as predicted theoretically by Hubbard and Torrance.

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页码：2920 / 2923

页数：4

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