Measurements of the complex conductivity of NbxSi1-x alloys on the insulating side of the metal-insulator transition -: art. no. 116602

被引：19

作者：

Helgren, E ^{[1
]}

Grüner, G

Ciofalo, MR

Baxter, DV

Carini, JP

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[2] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.87.116602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have conducted temperature and frequency dependent transport measurements in amorphous NbxSi1-x samples in the insulating regime. We find a temperature dependent dc conductivity consistent with variable range hopping in a Coulomb glass. The frequency dependent response in the millimeter-wave frequency range can be described by the expression sigma(omega)proportional to(-t omega)(alpha) with the exponent somewhat smaller than 1. Our ac results are not consistent with extant theories for the hopping transport.

引用

页码：116602 / 1

页数：4

共 20 条

[1]

Born M., 2006, PRINCIPLES OPTICS

[2] OBSERVATION OF THE APPROACH TO A POLARIZATION CATASTROPHE [J].

CAPIZZI, M ;

THOMAS, GA ;

DEROSA, F ;

BHATT, RN ;

RICE, TM .

PHYSICAL REVIEW LETTERS, 1980, 44 (15) :1019-1022

[3]

Efros A. L., 1985, Soviet Physics - JETP, V62, P1057

[4]

Efros A. L., 1985, Electron-electron interactions in disordered systems, P409

[5] COULOMB GAP AND LOW-TEMPERATURE CONDUCTIVITY OF DISORDERED SYSTEMS [J].

EFROS, AL ;

SHKLOVSKII, BI .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1975, 8 (04) :L49-L51

[6] FAR-INFRARED REFLECTANCE SPECTRA OF SI-P NEAR THE METAL-INSULATOR-TRANSITION [J].

GAYMANN, A ;

GESERICH, HP ;

VONLOHNEYSEN, H .

PHYSICAL REVIEW LETTERS, 1993, 71 (22) :3681-3684

[7] Temperature dependence of the far-infrared reflectance spectra of Si2:P near the metal-insulator transition [J].

Gaymann, A ;

Geserich, HP ;

vonLohneysen, H .

PHYSICAL REVIEW B, 1995, 52 (23) :16486-16493

[8] GIANT DIELECTRIC-CONSTANTS AT THE APPROACH TO THE INSULATOR-METAL TRANSITION [J].

HESS, HF ;

DECONDE, K ;

ROSENBAUM, TF ;

THOMAS, GA .

PHYSICAL REVIEW B, 1982, 25 (08) :5578-5580

[9]

HOHLS F, CONDMAT0011009

[10]

IMRY Y, 1995, ANDERSON INSULATORS, P181

← 1 2 →