The critical regime of the metal-insulator transition in conducting polymers: Experimental studies

被引:32
作者
Heeger, AJ [1 ]
机构
[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Santa Barbara, CA 93106 USA
关键词
D O I
10.1238/Physica.Topical.102a00030
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The metal-insulator (M-I) transition in conducting polymers is particularly interesting: critical behavior has been observed over a relatively wide temperature range in a number of systems, including polyacetylene. polypyrrole. poly (phenylene vinylene) and polyaniline. In each case. metallic, critical and insulating regimes have been identified through Zabrodskii plots of the logarithmic derivative of the conductivity. The critical regime (in which the conductivity varies as T-beta, where beta approximate to 1/3) is tunable by varying the extent of disorder and by applying external pressure and/or an external magnetic field. The transitions from metallic to critical behavior and from critical to insulating behavior have been induced with a magnetic field and from insulating to metallic behavior with applied pressure.
引用
收藏
页码:30 / 35
页数:6
相关论文
共 33 条
[31]  
SHKLOVSKII BL, 1984, ELECT PROCESSES DOPE
[32]   TRANSPORT NEAR THE METAL-INSULATOR-TRANSITION - POLYPYRROLE DOPED WITH PF(6) [J].
YOON, CO ;
REGHU, M ;
MOSES, D ;
HEEGER, AJ .
PHYSICAL REVIEW B, 1994, 49 (16) :10851-10863
[33]  
ZABRODSKY AG, 1984, ZH EKSP TEOR FIZ+, V86, P727