Density-wave charge dynamics in conducting polypyrrole

被引：7

作者：

Lee, K ^{[1
]}

Menon, R

Heeger, AJ

Kim, KH

Kim, YH

Schwartz, A

Dressel, M

Grüner, G

机构：

[1] Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Santa Barbara, CA 93106 USA

[2] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea

[3] Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA

[4] Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90095 USA

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.61.1635

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Reflectance spectra of polypyrrole (PPy) doped with PF6, obtained at 250 K and below, show the formation of a peak in the joint density of states at 110 cm(-1) and an associated redistribution of oscillator strength. In addition, a Fano-like resonance is observed at 70 cm(-1). We discuss the results in terms of a transition to a density-wave ground state characterized by an energy gap (2 Delta/hc approximate to 100 cm(-1)) and a pinned collective mode (at 70 cm(-1)). Despite the energy gap, PPy-PF6 remains "metallic" at low temperatures; i.e., the gap spans only a part of the Fermi surface.

引用

页码：1635 / 1638

页数：4

共 25 条

[1] Magnetoresistance of the metallic polyacetylene [J].

Choi, ES ;

Kim, GT ;

Suh, DS ;

Kim, DC ;

Park, JG ;

Park, YW .

SYNTHETIC METALS, 1999, 100 (01) :3-12

[2] Direct observation of the spin-density-wave gap in (TMTSF)(2)PF6 [J].

Degiorgi, L ;

Dressel, M ;

Schwartz, A ;

Alavi, B ;

Gruner, G .

PHYSICAL REVIEW LETTERS, 1996, 76 (20) :3838-3841

[3]

Gruner G, 1994, DENSITY WAVES SOLIDS

[4] SOLITONS IN CONDUCTING POLYMERS [J].

HEEGER, AJ ;

KIVELSON, S ;

SCHRIEFFER, JR ;

SU, WP .

REVIEWS OF MODERN PHYSICS, 1988, 60 (03) :781-850

[5]

HEEGER AJ, 1979, HIGHLY CONDUCTING 1

[6] INFRARED ACTIVITY OF PEIERLS SYSTEMS AND APPLICATION TO POLYACETYLENE [J].

HOROVITZ, B .

SOLID STATE COMMUNICATIONS, 1982, 41 (10) :729-734

[7] LOGARITHMIC TEMPERATURE-DEPENDENCE OF RESISTIVITY IN HEAVILY DOPED CONDUCTING POLYMERS AT LOW-TEMPERATURE [J].

ISHIGURO, T ;

KANEKO, H ;

NOGAMI, Y ;

ISHIMOTO, H ;

NISHIYAMA, H ;

TSUKAMOTO, J ;

TAKAHASHI, A ;

YAMAURA, M ;

HAGIWARA, T ;

SATO, K .

PHYSICAL REVIEW LETTERS, 1992, 69 (04) :660-663

[8] ORGANIC CONDUCTORS AND SUPERCONDUCTORS [J].

JEROME, D ;

SCHULZ, HJ .

ADVANCES IN PHYSICS, 1982, 31 (04) :299-490

[9] STRATEGIES FOR FINDING SUPERCONDUCTIVITY IN CONDUCTING POLYMERS [J].

KIVELSON, SA ;

EMERY, VJ .

SYNTHETIC METALS, 1994, 65 (2-3) :249-254

[10] DRUDE METALLIC RESPONSE OF POLYPYRROLE [J].

KOHLMAN, RS ;

JOO, J ;

WANG, YZ ;

POUGET, JP ;

KANEKO, H ;

ISHIGURO, T ;

EPSTEIN, AJ .

PHYSICAL REVIEW LETTERS, 1995, 74 (05) :773-776

← 1 2 3 →