Open AccessEffect of Silver Substitution on Electrical Transport and Magnetoresistance of La0.8Ca0.2MnO3
Author(s) -
Dicky Rezky Munazat,
Budhy Kurniawan,
Agung Imaddudin,
R. Kamila,
Dhawud Sabilur Razaq
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/546/4/042025
Subject(s) - magnetoresistance , condensed matter physics , curie temperature , electrical resistivity and conductivity , materials science , scattering , atmospheric temperature range , variable range hopping , thermal conduction , magnetic field , ferromagnetism , physics , thermodynamics , quantum mechanics , optics , composite material
In this work, we have investigated the effect of silver substitution on electrical transport behavior and magnetoresistance of La 0.8- x Ag x Ca 0.2 MnO 3 (x = 0 and 0.05). Preparation and study of structural and microstructure of both samples have been reported on previous work. Temperature-dependent resistivity has been measured at temperature range of 15-285 K with zero field cooling. Magnetoresistance effect has been measured at 15, 100, and 285 K with magnetic field up to 1 T. The electrical transport behavior of both samples are quite well described by a theory based on the Percolation model. The electrical conduction mechanism at low temperature can be explained by a theory based on Kondo-like spin-dependent scattering, electron-electron, electron–magnon, and electron-phonon scattering. It was found that silver substitution increases the metal-insulator transition temperature (T M-I ) from 197.55 to 277.56 K, and Curie temperature (T c Mod ) from 217.25 to 278.65 K. Moreover, the maximum magnetoresistance value of both samples was obtained at 15 K.