SUPERCONDUCTIVITY IN POLYCRYSTALLINE PRESSED PELLETS OF KAPPA-(BEDT-TTF)2I3

被引：14

作者：

BALTHES, E

BREINING, A

KAHLICH, S

MOLDENHAUER, J

SCHWEITZER, D

BELE, P

BRUNNER, H

HEINEN, I

NUBER, B

KELLER, HJ

机构：

[1] MED FORSCH AG,MPI,W-6900 HEIDELBERG,GERMANY

[2] UNIV HEIDELBERG,INST ANORGAN CHEM,W-6900 HEIDELBERG,GERMANY

来源：

SYNTHETIC METALS | 1993年 / 56卷 / 2-3期

关键词：

D O I：

10.1016/0379-6779(93)90047-Z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Investigations of the transport properties of single crystals and polycrystalline pressed samples of K-(BEDT-TTF)213 are presented. In contrast to polycrystalline pressed samples of K-(BEDT-TTF)2Cu(NCS)2 and K-(BEDT-TTF)2Cu[N(CN)2]Br those of K-(BEDT-TTF)2I3 show bulk superconductivity indicating that the loss of superconductivity in the first two types of samples is not due to the special structure of the K- phase, but probably due to a disproportionation of Cu1+ under the anisotropic pressure during the preparation of the samples. Annealing the single crystals as well as the polycrystalline pressed samples of K-(BEDT-TTF)2I3 at 75-degrees-C for a few days results in a structural transfomation with an increase in the transition temperature for superconductivity (about 8 K for the crystals). IR-spectra indicate a transfomation into a structure which is identical with alpha(t) - (BEDT - TTF)2I3, which seems to be the thermodynamically most stable phase of the several (BEDT-TTF)2I3 phases.

引用

页码：2859 / 2864

页数：6

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