Magnetocaloric effect of electron-doped manganite La0.9Te0.1MnO3

The magnetocaloric effect of an electron-doped manganite La0.9Te0.1MnO3 has been investigated. The sample of La0.9Te0.1MnO3 undergoes the paramagnetic-ferromagnetic transition at 239 K. It is obtained that the effective magnetic moment (mu(eff)=4.923 mu(B)) and the saturation moment (mu(S) =4.08 mu(B)/Mn) are close to the respective expected values. The isothermal magnetization versus applied magnetic field at various temperatures between 180 and 300 K was measured, and the temperature dependence of magnetic entropy change vertical bar Delta S-M vertical bar for La0.9Te0.1MnO3 was understood. It is found that the sample shows a large magnetic entropy change near T-C and the magnitude of magnetic entropy change is comparable to some hole-doped manganites. However, the relative cooling power of the electron-doped manganite La0.9Te0.1MnO3 is higher than that of some hole-doped manganites, which is an advantage for the engineer to design the magnetic refrigeration materials. Moreover, the temperature dependence of magnetic entropy change vertical bar Delta SM vertical bar cannot be explained well based on the Landau theory of phase transition, and the contribution of the Jahn-Teller effect needs to be taken into account for La0.9Te0.1MnO3. (c) 2007 American Institute Of Physics.