Anomalous first-to-zero sound crossover in La1-x Cax Mn O3

Yuhang Ren, G. Lüpke, Yufeng Hu, Qi Li, C. S. Hong, N. H. Hur, R. Merlin

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Abstract

The elastic properties of La1-x Cax Mn O3 (x≈1 3) are anomalous, particularly in the paramagnetic phase, where values of the longitudinal sound velocity at ∼ 1010 Hz, in the zero-sound regime, are more than 50% larger than those from ultrasound experiments at 103 - 106 Hz. Such a behavior, indicative of coupling to relaxation processes, is similar to that of liquids and soft viscoelastic matter, but quite unusual for a hard solid. These results suggest that the physics of phase separation in manganites is more complex than that of a stationary mixture of competing phases.

Original languageEnglish (US)
Article number012405
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number1
DOIs
Publication statusPublished - Jul 24 2006

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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