Influence of oxygen isotope exchange on the ground state of manganites

V. N. Smolyaninova, Amlan Biswas, P. Fournier, S. Lofland, X. Zhang, Guo Meng Zhao, R. L. Greene

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Abstract

We report a study of oxygen isotope effects on the low-temperature specific heat, magnetization, and resistivity of La1-xCaxMnO3 and (La1-yPry)0.67Ca0.33 MnO3. For metallic compositions of La1-xCaxMnO3 and for charge-ordered La0.5Ca0.5MnO3 no change in the low-temperature specific heat has been detected with 16O-18O exchange, while compounds of (La1-yPry)0.67Ca0.33 MnO3 (0.4<y<0.6) show a significant change in low-temperature properties. The low-temperature specific heat indicates the presence of a charge-ordered phase even in compositions of (La1-yPry)0.67Ca0.33 MnO3 which are metallic at low temperatures. We suggest that the changes induced by the oxygen isotope exchange are caused by an increase of the charge-ordered phase in 18O samples.

Original languageEnglish (US)
Article number104419
Pages (from-to)1044191-1044199
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number10
StatePublished - Mar 1 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Smolyaninova, V. N., Biswas, A., Fournier, P., Lofland, S., Zhang, X., Zhao, G. M., & Greene, R. L. (2002). Influence of oxygen isotope exchange on the ground state of manganites. Physical Review B - Condensed Matter and Materials Physics, 65(10), 1044191-1044199. [104419].