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

Lay Sheng Ewe, Imad Hamadneh, Hazar A. Salama, R. Abd-Shukor

Research output: Contribution to journalArticle

10 Citations (Scopus)

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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Manganites
Acoustic wave velocity
acoustic velocity
Perovskite
grain size
shear
Superconducting transition temperature
Hysteresis
echoes
transition temperature
hysteresis
insulators
anomalies
Cooling
cooling
heating
pulses
Metals
metals
perovskite

All Science Journal Classification (ASJC) codes

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

Cite this

Ewe, Lay Sheng ; Hamadneh, Imad ; Salama, Hazar A. ; Abd-Shukor, R. / Sound velocity in perovskite manganites La0.67Ca0.33MnO3 with different grain sizes. In: Physica B: Condensed Matter. 2008 ; Vol. 403, No. 13-16. pp. 2394-2398.
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Sound velocity in perovskite manganites La0.67Ca0.33MnO3 with different grain sizes. / Ewe, Lay Sheng; Hamadneh, Imad; Salama, Hazar A.; Abd-Shukor, R.

In: Physica B: Condensed Matter, Vol. 403, No. 13-16, 01.07.2008, p. 2394-2398.

Research output: Contribution to journalArticle

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AB - 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.

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