Enhancement of TC and reentrant spin-glass transition in La0.86Ca0.14Mn1-yCryO3 y = 0, 0.1 and 0.2Report as inadecuate




Enhancement of TC and reentrant spin-glass transition in La0.86Ca0.14Mn1-yCryO3 y = 0, 0.1 and 0.2 - Download this document for free, or read online. Document in PDF available to download.

1 CHIMSOL - Laboratoire de Physico-Chimie de l-Etat Solide

Abstract : We report on the structural, frequency dependent ac susceptibility, dc magnetization and magnetoresistance MR measurements on polycrystalline samples of La0.86Ca0.14Mn1-yCryO3y = 0, 0.1 and 0.2 prepared by sol-gel technique. For y = 0, a paramagnetic to ferromagnetic transition was observed at TC = 185 K. For y = 0.1, the value of TC = 200 K, an increase of 15 K and for y = 0.2, the TC = 195 K, an increase of 10 K. The imaginary part of the ac susceptibility of all the three samples shows a secondary transition at Tf < TC. For y = 0, there is no definite law to account for the frequency dependence of Tf and is attributed to a transition arising out of a canted structure. However, in the case of y = 0.1 and 0.2, the frequency dependence indicate the presence of a reentrant spin glass transition at Tf. Though all the three samples show a semi-conducting behavior between 300 and 5 K, a negative MR was observed corresponding to TC and Tf. The value of MR decreased for the Cr substituted samples.

keyword : spin glass manganites Cr substitution magneto resistance





Author: R. Suryanarayanan - T. Sudyoadsuk; - T. Winotai -

Source: https://hal.archives-ouvertes.fr/



DOWNLOAD PDF




Related documents