• DOI:10.1088/0953-8984/16/21/017
• Corpus ID: 96046066

Enhancement of Tc and the re-entrant spin glass transition in La0.86Ca0.14Mn1−yCryO3 (y = 0, 0.1 and 0.2)

@article{Suryanarayanan2004EnhancementOT,
  title={Enhancement of Tc and the re-entrant spin glass transition in La0.86Ca0.14Mn1−yCryO3 (y = 0, 0.1 and 0.2)},
  author={R. Suryanarayanan and Taweesak Sudyoadsuk and T. Winotai},
  journal={Journal of Physics: Condensed Matter},
  year={2004},
  volume={16},
  pages={3691-3702}
}

• R. Suryanarayanan, T. Sudyoadsuk, T. Winotai
• Published 1 May 2004
• Physics
• Journal of Physics: Condensed Matter

We report on structural, frequency dependent ac susceptibility, dc magnetization and magnetoresistance (MR) measurements on polycrystalline samples of La0.86Ca0.14Mn1−yCryO3 (y = 0, 0.1 and 0.2) prepared by the 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, Tc = 195 K,an increase of 10 K. The imaginary part of the ac susceptibility for all three samples shows a secondary transition at Tf< Tc. For y = 0, there is no definite law accounting for the frequency dependence of Tf and it is attributed to a transition arising out of a canted structure. However, in the cases of y = 0.1 and 0.2, the frequency dependence indicates the presence of a re-entrant spin glass transition at Tf. Although all three samples show a semiconducting behaviour 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.