Electron Transport Properties of Fe-Doped Bi-Layered Managnites La1.6Dy0.2Sr1.2Mn2-xFexO7

Author

Basith, M.A. ; Shaha, T. Chanda ; Huq, M.

Author_Institution

Dept. of Phys., Bangladesh Univ. of Eng. & Technol., Dhaka

fYear

2006

fDate

19-21 Dec. 2006

Firstpage

386

Lastpage

389

Abstract

The effect of Fe on the electron transport and magnetoresistive properties of layered perovskite manganites La_1.6Dy_0.2Sr_1.2Mn_{2 - x}Fe_xO₇, which consists of two [MnO₂] layers intertwined with a rock-salt type layer of [(La,Dy,Sr)₂O₂] have been investigated. The metal-insulator (M-I) transition and magnetoresistance phenomena were observed. The substitution of Mn by Fe decreases M-I transition temperature. As the ionic radii of Mn³⁺ and Fe³⁺ are similar for low Fe content samples, the crystal distortion induced by Fe substitution is not obvious. But the substitution of Mn by Fe suppresses the double-exchange interaction, weakness the ferromagnetism and consequently decreases the M-I transition temperature. The substitution of Fe also causes a depletion of the Mn³⁺/Mn⁴⁺ ratio and the population of the hopping electrons that ultimately reduces metallic conduction. The polycrystalline samples exhibit a sharp drop in the magnetoresistance at low magnetic fields

Keywords

chemical exchanges; doping; dysprosium compounds; hopping conduction; iron; iron compounds; lanthanum compounds; magnetic multilayers; magnetoresistance; manganese compounds; metal-insulator transition; strontium compounds; LaDySrMnFeO; bi-layered manganites; crystal distortion; double-exchange interaction; electron transport properties; ferromagnetism; hopping electrons; ionic radii; layered perovskite manganites; magnetoresistance phenomena; magnetoresistive properties; metal-insulator transition; metallic conduction; substitution; transition temperature; Colossal magnetoresistance; Conductivity; Doping; Electrons; Iron; Magnetic fields; Magnetic materials; Magnetic properties; Powders; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2006. ICECE '06. International Conference on

Conference_Location

Dhaka

Print_ISBN

98432-3814-1

Type

conf

DOI

10.1109/ICECE.2006.355652

Filename

4178488