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Disorder effects at low temperatures in La0.7−xYxCa0.3MnO3 manganites

✍ Scribed by M.A. Gusmão; L. Ghivelder; R.S. Freitas; R.A. Ribeiro; O.F. de Lima; F. Damay; L.F. Cohen

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
162 KB
Volume
127
Category
Article
ISSN
0038-1098

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✦ Synopsis

With the aim of probing the effect of magnetic disorder in the low-temperature excitations of manganites, specific heat measurements were performed in zero field, and in magnetic fields up to 9 T in polycrystalline samples of La 0:72x Y x Ca 0:3 MnO 3 ; with Y concentrations x ¼ 0; 0.10, and 0.15. Yttrium doping yielded the appearance of a cluster-glass state, giving rise to unusual low-temperature behavior of the specific heat. The main feature observed in the results is a strong enhancement of the specific heat linear term, which is interpreted as a direct consequence of magnetic disorder. The analysis was further corroborated by resistivity measurements in the same compounds.

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