Transport and magnetic properties in perovskite compound

Abstract

Magnetic and transport properties of the series (x = 0, 0.01, 0.03, 0.05, 0.1, 0.3, 0.5, 1.0) have been investigated. It was found that with increasing Co content, the Curie temperature decreases, while the spin glass transition temperature decreases first then increases. As for the sample with x = 0.3, the relation of and the merging point (for the zero-field-cooled and field-cooled magnetization curves starting to merge) with the applied magnetic field H follows a relation , ), where and are constants. The resistivity increases drastically with Co doping and a semiconductor-like behaviour is displayed in the sample x = 0.3. These facts strongly suggest that the double-exchange interaction in the perovskite materials is very fragile since a small Co content can change the magnetic and relevant transport properties of the system.

Structural properties and electrical resistivity of Na-substituted lanthanum manganites: La1−xNaxMnO3+y (x=0.1, 0.125 and 0.15)

“…via Jahn-Teller effects and large Hund's coupling effect that optimizes the electronic kinetic energy by the formation of ferromagnetic phase. However, it has been found that factors such as the average size of the cations, vacancies at La and Mn-sites and the oxygen stoichiometry also plays a crucial role in electrical and magnetic properties of manganite materials [11][12][13][14]. The key query is that are the monovalent-doped manganites fulfill the criterions set for divalent-doped manganites.…”

Magnetic properties and low-field magnetoresistance of La0.7Sr0.3Mn0.9M0.1O3 compounds (M=Al, Cr, Mn, Fe, Co, Ni, Cu, and Ga)

“…Tel. : +86 10 62521523; fax: +86 10 62517887. substitution by various other ions such as Al [14,15], or transition metals Cr [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], Fe [18,20,[31][32][33][34][35][36][37][38][39][40][41], Co [20,25,[42][43][44][45][46][47][48], Ni [20,37,[49][50][51][52][53], Cu [20,[54][55][56][57][5...…”

Re-entrant spin glass transition in La 0.96 − y Nd y K 0.04 MnO 3 : Origin and effects on the colossal magnetoresistivity

“…Indications of such a transition have already been reported for CMR compounds, but without presenting convincing experimental evidences for its existence. Usually, the authors consider that a low temperature cusp in the zero-field-cooled (ZFC) magnetisation, leading to a difference between the ZFC and field cooled (FC) magnetisation curves at low temperatures, is enough to evidence a low temperature RSG phase [6][7][8][9]. Ac-susceptibility measurements are sometimes added; a frequency dependent ac-susceptibility is then attributed to the RSG phase [10][11][12].…”