Study of the conductance and magnetotransport of CrO2-TiO2 composites

被引：14
作者：
Chen, YJ [1 ]
Zhang, XY
Cai, TY
Li, ZY
机构：
[1] Suzhou Univ, Dept Phys, Suzhou 215006, Peoples R China
[2] CCAST, World Lab, Beijing 100080, Peoples R China
来源：
MATERIALS LETTERS | 2004年 / 58卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
magnetoresistance; electrical conductivity; composite; percolation; powder consolidation;
D O I：
10.1016/S0167-577X(03)00457-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This letter presents an experimental study of the correlation between low field magnetoresistance (MR) and percolation process, and the dependence of conductance on temperature between 77 and 300 K in the CrO2-TiO2 composites. We also discuss the conduction mechanisms of the composites and conclude that the conductance is mainly attributed to higher-order hopping at higher temperature. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：262 / 266
页数：5
相关论文
共 19 条
[1]  
Chen YJ, 2003, CHINESE PHYS LETT, V20, P721, DOI 10.1088/0256-307X/20/5/337
[2]   Characterization of the native Cr2O3 oxide surface of CrO2 [J].
Cheng, RH ;
Xu, B ;
Borca, CN ;
Sokolov, A ;
Yang, CS ;
Yuan, L ;
Liou, SH ;
Doudin, B ;
Dowben, PA .
APPLIED PHYSICS LETTERS, 2001, 79 (19) :3122-3124
[3]   Magnetoresistance of chromium dioxide powder compacts [J].
Coey, JMD ;
Berkowitz, AE ;
Balcells, L ;
Putris, FF ;
Barry, A .
PHYSICAL REVIEW LETTERS, 1998, 80 (17) :3815-3818
[4]   Powder magnetoresistance (invited) [J].
Coey, JMD .
JOURNAL OF APPLIED PHYSICS, 1999, 85 (08) :5576-5581
[5]   Characterization of the natural barriers of intergranular tunnel junctions:: Cr2O3 surface layers on CrO2 nanoparticles [J].
Dai, JB ;
Tang, JK ;
Xu, HP ;
Spinu, L ;
Wang, WD ;
Wang, KY ;
Kumbhar, A ;
Li, M ;
Diebold, U .
APPLIED PHYSICS LETTERS, 2000, 77 (18) :2840-2842
[6]   Junction-like magnetoresistance of intergranular tunneling in field-aligned chromium dioxide powders [J].
Dai, JB ;
Tang, JK .
PHYSICAL REVIEW B, 2001, 63 (05)
[7]   Temperature dependence of the conductance and magnetoresistance of CrO2 powder compacts -: art. no. 064410 [J].
Dai, JB ;
Tang, JK .
PHYSICAL REVIEW B, 2001, 63 (06)
[8]  
GLAZMAN LI, 1988, ZH EKSP TEOR FIZ, V67, P1276
[9]   Magnetic and transport properties of epitaxial and polycrystalline chromium dioxide thin films (invited) [J].
Gupta, A ;
Li, XW ;
Xiao, G .
JOURNAL OF APPLIED PHYSICS, 2000, 87 (09) :6073-6078
[10]   TUNNELING OF SPIN-POLARIZED ELECTRONS AND MAGNETORESISTANCE IN GRANULAR NI FILMS [J].
HELMAN, JS ;
ABELES, B .
PHYSICAL REVIEW LETTERS, 1976, 37 (21) :1429-1432
12