Structural, magnetic and magnetocaloric properties of vanadium-doped manganites La0.65Ca0.35Mn1−xVxO3 (0 ⩽ x ⩽ 0.5)

- Our samples were prepared using solid state reaction method.
- All samples crystallized in orthorhombic structure with Pbnm space group.
- Presence of secondary phase LaVO4 in V-doped samples.
- Our samples exhibit PM-FM transition at Curie temperature.
- The Curie temperature decreases with V-doping (262 K for x = 0 to 206 K for x = 0.5).
- The Magnetic transition was found to be of second order.

Structural, magnetic and magnetocaloric properties of polycrystalline La0.65Ca0.35Mn1−xVxO3 have been investigated. Our samples were prepared using the solid state reaction method at high temperatures. X-ray diffraction analysis show that all samples crystallized in the orthorhombic structure with Pbnm space group with presence of LaVO4 as secondary phase. The SEM micrographs reveal micrometric grains with bimodal size distribution. Magnetic Measurements indicate that our samples exhibit a PM-FM transition, with a Curie temperature (TC) decreasing from 262 K for x = 0 to 208 K for x = 0.5; in addition to the presence of the Griffiths phase in the paramagnetic region. Using the isothermal magnetization versus magnetic applied field, we have deduced that the occured magnetic transition is of second order. Moreover, we have calculated the magnetic entropy change, which reaches 5.25 J/kg K for La0.65Ca0.35Mn0.5V0.5O3 compound under 5T. This value is associated to a relative cooling power (RCP) of 207 J/kg.