Phase separation, transport and magnetic properties of La2/3A1/3Mn1-xCoxO3, A = Ca, Sr (0.5≤x≤1)

• Published in: Physica. B, Condensed matter Vol. 403; no. 5-9; pp. 1622 - 1624
• Main Authors: DEAC, Iosif G, TETEAN, Romulus, BURZO, Emil
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Amsterdam Elsevier 01-04-2008
• Subjects: Colossal magnetoresistance; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic properties and materials; Magnetotransport phenomena, materials for magnetotransport; Manganites; Physics; Studies of specific magnetic materials; Negative magnetoresistance; Electrical conductivity; Magnetization; Ferromagnetic materials; Polycrystals; Perovskites; Colossal magnetoresistance; Magnetic susceptibility; Spin cluster; Spin clusters; Phase separation; Semiconductivity; Transport processes; Embedded cluster method; Manganites; Magnetic properties; Cobaltites
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2007.10.203

We present the low-temperature physical properties of the polycrystalline perovskite systems La2/3A1/3Mn1-xCoxO3, A=Ca, Sr (0.5x1) including electrical resistance, magnetization, ac and dc susceptibilities. The experimental data suggest the presence of correlated ferromagnetic clusters embedded in some non-ferromagnetic matrix. The systems show semiconducting behavior and negative magnetoresistance.