Sound velocity in perovskite manganites La0.67Ca0.33MnO3 with different grain sizes

L. S. Ewe, Imad Hamadneh, Hazar A. Salama, R. Abd-Shukor

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Abstract

The longitudinal and shear sound velocities in colossal magnetoresistive material La0.67Ca0.33MnO3 sintered at 1100, 1250 and 1350 °C with average grain size 1, 3 and 5 μm, respectively, have been measured from 80 to 300 K using the pulse-echo-overlap method. A pronounced increase in the longitudinal sound velocity was observed in all samples around the insulator-metal transition temperature (TIM∼272 K). XRD patterns showed the orthorhombic structure for all samples. The longitudinal and shear velocities showed the largest hysteresis for the sample with 3 μm grain size. A step-like shear sound velocity anomaly near 120 K during cooling or warming was observed to be dependent on the grain size.

Original languageEnglish
Pages (from-to)2394-2398
Number of pages5
JournalPhysica B: Condensed Matter
Volume403
Issue number13-16
DOIs
Publication statusPublished - 01 Jul 2008

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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