STRUCTURE AND PROPERTIES OF A NEW KAPPA-PHASE ORGANIC METAL - (BEDT-TTF)2CU2(CN)3

被引：30

作者：

BU, XH ^{[1
]}

FROSTJENSEN, A ^{[1
]}

ALLENDOERFER, R ^{[1
]}

COPPENS, P ^{[1
]}

LEDERLE, B ^{[1
]}

NAUGHTON, MJ ^{[1
]}

机构：

[1] SUNY BUFFALO,DEPT PHYS & ASTRON,BUFFALO,NY 14260

来源：

SOLID STATE COMMUNICATIONS | 1991年 / 79卷 / 12期

关键词：

D O I：

10.1016/0038-1098(91)90009-K

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The electro-synthesis, structure and conductivity of a new kappa-phase organic metal (BEDT-TTF)2Cu2(CN)3 are described [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene, C10H8S8]. Partially oxidized BEDT-TTF cations form a structure similar to that found in the kappa-phase superconductors, while Cu2(CN)3-1 anions form infinite two-dimensional sheets which alternate with layers of BEDT-TTF cations along the crystallographic a axis. The morphology and conductivity of the crystals are dependent on the electrocrystallization conditions. Samples prepared under certain conditions show a semiconductor-to-metal transition in the 10-30K range, while others have an immeasurably large resistance in this temperature range, even though the room-temperature crystal structures are identical, and EDX shows all samples to have the same composition. However, application of a thin layer of epoxy induces the transition in all samples, and enhances the low-temperature conductivity of some samples by a factor of about 100. Low temperature crystallographic measurements of the unit cell change on cooling indicate the epoxy-coating to reduce the thermal contraction of the samples, in particular in the direction of the crystallographic a-axis.

引用

页码：1053 / 1057

页数：5

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