Physics – Condensed Matter
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jpcm...15.4001y&link_type=abstract
Journal of Physics: Condensed Matter, Volume 15, Issue 23, pp. 4001-4010 (2003).
Physics
Condensed Matter
1
Scientific paper
This paper investigates the relation between the temperature dependence of magnetoresistance (MR) and spin frustration in LaMnO3+δ when Ni is doped into the Mn site. The specimens experience magnetic frustration introduced by the competition between antiferromagnetic (AFM) and ferromagnetic (FM) interactions. According to the temperature dependence of magnetization after cooling the specimen in zero field and non-zero field, Ni-doped specimens behave like cluster glasses. This magnetic frustration at the low temperature is believed to result from the disordered spin structure between AFM and FM phases in these specimens. When the structural symmetry in the specimen is higher, the FM arrangement increases by double the exchange interaction. However, MR decreases in the same temperature region for the same reason. We suggest that the temperature dependence of MR below the Curie temperature in the Ni-doped specimen is controlled by the change of magnetization that occurs with structural change.
Oda Kagayaki
Yamamoto Aishi
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