MN SUBSTITUTION EFFECT ON THE STRUCTURAL AND MAGNETIC PROPERTIES IN La_0.54Ho_0.11Sr_0.35Mn_1-xV_xO₃ MANGANITES

Mihail-Liviu Craus^{1, 2*}, Valeryi Simkin²,  Nicoleta Cornei³ and Viorel Dobrea¹

¹National Institute of Research and Development for Technical Physics, Iasi, Romania

ABSTRACT

Manganites, as La_1-xSr_xMnO₃, are known as ferromagnetic materials, with a “bad metal” behavior, and a transition temperature close to Curie temperature.  The manganites with La_0.54Ho_0.11Sr_0.35Mn_1-xV_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=14 kOe. Magnetoresistance data were obtained with a four probe method, between 7 and 300 K. Treated samples contain perovskite type phase as majority phase, depending on the Mn substitution with V. Structure modification, magnetic properties and transport mechanisms are discussed, in agreement with the V doping.

KEYWORDS: manganites, crystalline structure, magnetoresistance, transport mechanisms, vanadium