BREAKDOWN OF THE SPIN-PEIERLS STATE IN A ONE-DIMENSIONAL MODEL FOR ELECTRON-LIBRON COUPLING

被引：5

作者：

BARANOWSKI, D ^{[1
]}

BUTTNER, H ^{[1
]}

VOIT, J ^{[1
]}

机构：

[1] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.47.15472

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study a one-dimensional model for electron-libron coupling in polyaniline with a half-filled band in the spin-Peierls (SP) limit of strong repulsive on-site correlations U. A phonon mean-field treatment produces a rich phase diagram with an SP state, but undistorted paramagnetic and antiferromagnetic states may be more stable for certain parameters, implying the possibility of dimerization breakdown with increasing U. This contrasts universally accepted results for polyacetylene where dimerization persists for all U. Our results originate in the relevance of a steric order parameter for librons which distinguishes the situation from that for acoustic phonons.

引用

页码：15472 / 15475

页数：4

共 20 条

[1]

BAERISWYL D, 1992, CONDUCTING POLYM, V102

[2] INFLUENCE OF LIBRONIC DEGREES OF FREEDOM ON ELECTRONIC-PROPERTIES OF POLYANILINE [J].

BARANOWSKI, D ;

BUTTNER, H ;

VOIT, J .

PHYSICAL REVIEW B, 1992, 45 (19) :10990-11003

[3]

BARANOWSKI D, UNPUB

[4]

Bray J. W., 1983, Extended linear chain compounds. Vol.3, P353

[5]

COPLIN KA, IN PRESS SYNTH MET

[6] NEW THEORY OF THE SPIN-PEIERLS TRANSITION WITH SPECIAL RELEVANCE TO THE EXPERIMENTS ON TTFCUBDT [J].

CROSS, MC ;

FISHER, DS .

PHYSICAL REVIEW B, 1979, 19 (01) :402-419

[7] PHENYL RING ROTATIONS, STRUCTURAL ORDER AND ELECTRONIC STATES IN POLYANILINE [J].

GINDER, JM ;

EPSTEIN, AJ ;

MACDIARMID, AG .

SYNTHETIC METALS, 1990, 37 (1-3) :45-55

[8] ROLE OF RING TORSION ANGLE IN POLYANILINE - ELECTRONIC-STRUCTURE AND DEFECT STATES [J].

GINDER, JM ;

EPSTEIN, AJ .

PHYSICAL REVIEW B, 1990, 41 (15) :10674-10685

[9]

GINDER JM, 1991, SYNTHETIC MET, V41, P3431

[10]

GRUPP A, 1992, SPRINGER SERIES SOLI, V76, P156

← 1 2 →