The effect of TiO2 doping on the structure and magnetic and magnetotransport properties of La0.75Sr0.25MnO3 composite -: art. no. 043908

被引:43
作者
Kameli, P [1 ]
Salamati, H
Eshraghi, M
Mohammadizadeh, MR
机构
[1] Isfahan Univ Technol, Dept Phys, Esfahan 84156, Iran
[2] Tarbiat Moalem Univ Azerbaijan, Dept Phys, Tabriz 53714161, Iran
[3] Isfahan Univ Technol, Dept Phys, Esfahan 84156, Iran
[4] Univ Tehran, SRL, Tehran 14395547, Iran
关键词
D O I
10.1063/1.2032614
中图分类号
O59 [应用物理学];
学科分类号
摘要
The effect of TiO(2) doping on the structure and magnetic and magnetotransport properties of La(0.75)Sr(0.25)MnO(3) (LSMO)/xTiO(2) has been investigated. These studies show that at low doping level (x <= 2) TiO(2) mainly goes into the grain-boundary region, but at high doping level (x >= 3), some part of the TiO(2) goes into the perovskite lattice substituting Mn in LSMO and the remainder segregates as a separate phase at the grain boundaries. Results also show that the TiO(2) doping has an important effect on a low-field magnetoresistance. In the magnetic field of 8000 Oe and at 77 K a magnetoresistance value of similar to 20% was observed for the composite with a TiO(2) doping level of x=2. (c) 2005 American Institute of Physics.
引用
收藏
页数:4
相关论文
共 16 条
[1]   Enhanced field sensitivity close to percolation in magnetoresistive La2/3Sr1/3MnO3/CeO2 composites [J].
Balcells, L ;
Carrillo, AE ;
Martínez, B ;
Fontcuberta, J .
APPLIED PHYSICS LETTERS, 1999, 74 (26) :4014-4016
[2]   Magnetic and electrical transport properties of La0.67Ca0.33MnO3 (LCMO):: xZnO composites [J].
Das, D ;
Srivastava, CM ;
Bahadur, D ;
Nigam, AK ;
Malik, SK .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2004, 16 (23) :4089-4102
[3]   Large magnetoresistance in (La1-xCaxMnO3)1-y:ZrO2 composite [J].
Das, D ;
Saha, A ;
Russek, SE ;
Raj, R ;
Bahadur, D .
JOURNAL OF APPLIED PHYSICS, 2003, 93 (10) :8301-8303
[4]   Defect-induced spin disorder and magnetoresistance in single-crystal and polycrystal rare-earth manganite thin films [J].
Evetts, JE ;
Blamire, MG ;
Mathur, ND ;
Isaac, SP ;
Teo, BS ;
Cohen, LF ;
Macmanus-Driscoll, JL .
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1998, 356 (1742) :1593-1613
[5]   Condensed-matter physics - New forms of phase segregation [J].
Goodenough, JB ;
Zhou, JS .
NATURE, 1997, 386 (6622) :229-230
[6]   Spin-flip scattering in magnetic junctions [J].
Guinea, F .
PHYSICAL REVIEW B, 1998, 58 (14) :9212-9216
[7]  
GUPTA A, 1996, PHYS REV B, V54, pR1562
[8]   Spin-polarized intergrain tunneling in La-2/Sr-3(1)/3MnO3 [J].
Hwang, HY ;
Cheong, SW ;
Ong, NP ;
Batlogg, B .
PHYSICAL REVIEW LETTERS, 1996, 77 (10) :2041-2044
[9]   THOUSANDFOLD CHANGE IN RESISTIVITY IN MAGNETORESISTIVE LA-CA-MN-O FILMS [J].
JIN, S ;
TIEFEL, TH ;
MCCORMACK, M ;
FASTNACHT, RA ;
RAMESH, R ;
CHEN, LH .
SCIENCE, 1994, 264 (5157) :413-415
[10]   Magnetic properties and colossal magnetoresistance of the perovskites La2/3Ca1/3Mn1-xTixO3 [J].
Li, RW ;
Wang, ZH ;
Chen, X ;
Sun, JR ;
Shen, BG ;
Yan, CH .
JOURNAL OF APPLIED PHYSICS, 2000, 87 (09) :5597-5599