2010, Volume 13, Issue 2
Influence of Mn Substitution with Fe/Co on Magnetic Structure and Transport Mechanisms in Some Manganites
1 National Institute of Research and Development for Technical Physics, Iasi, Romania
2 Joint Institute for Nuclear Research, Dubna, 141980, Russia
3 ”Al.I.Cuza” University, Chemistry Departament, Iasi, Romania
Many manganites are known as ferromagnetic materials, with a “bad metal” behavior, and a transition temperature close to Curie temperature. The manganites with La0.54Ho0.11Sr0.35Mn1-x(Co/Fe)xO3 were prepared by means of sol-gel methods. The treated samples were monitorized by XRD, while magnetic properties of the samples were investigate with a Foner type magnetometer, between 77 and 400 K, using a magnetic field H=1.4 T. Magnetoresistance data were obtained with a four probe method, in a magnetic field Hmax = 1 T, between 7 and 350 K. Treated samples contain only perovskite type phases, depending on the Mn substitution. Structure modification, magnetic properties and transport mechanisms are discussed, in agreement with the Sr/Ca doping.
Manganites, magnetic/crystalline structure, magnetoresistance, transport mechanisms.
Tag search Manganites magneticcrystalline structure magnetoresistance transport mechanisms