Electrical Transport and magnetoresistance properties of La0.8Ca0.2-xAgxMnO3 (x = 0 and 0.05)

9th Annual Basic Science International Conference 2019

自然科学（总论）

Razaq, Dhawud Sabilur^1 ; Kurniawan, Budhy^1 ; Imaddudin, Agung^2 ; Sahara, Nabila Aisyah^1 ; Munazat, Dicky Rezky^1

Department of Physics, Universitas Indonesia, Depok

16424, Indonesia^1

Research Center for Metallurgy and Materials, Indonesian Institute of Sciences (LIPI), Gedung 470, Puspiptek, South Tangerang, Banten

15314, Indonesia^2

关键词: Electrical transport;    Electron phonon;    Magnetic field influence;    Magnetoresistance properties;    Metal-semiconductor transitions;    Polycrystalline;    Resistivity data;    Resistivity measurement;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/546/4/042037/pdf
DOI  :  10.1088/1757-899X/546/4/042037

学科分类：自然科学（综合）

来源: IOP

【 摘 要 】

A systematic investigation of electrical transport and magnetoresistance properties of polycrystalline La0.8Ca0.2-xAgxMnO3 (x = 0 and 0.05) is reported in this work. According to the resistivity data measured from 40 to 250 K, transition from metallic to insulator behavior upon heating were observed in both samples. Additionally, 5% silver substitution shifts the metal-semiconductor transition into a higher temperature. Furthermore, silver substitution also decreases the overall temperature compared to the original compound. In this work, this result can be well described using electron-electron, electron-phonon, and the interaction between electron, phonon, and magnon. Resistivity measurements under magnetic field influence shows that silver substitution improves the magnetoresistance properties compared to the original compound. The maximum ratio of magnetoresistance at 285 K was found to be 3.3% and 4.7% for x = 0 and 0.05, respectively.