Phys. Rev. B 74, 012405 (2006) [3 pages]Anomalous first-to-zero sound crossover in La1−xCaxMnO3Received 6 February 2006; published 18 July 2006 The elastic properties of La1−xCaxMnO3 (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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.74.012405
DOI:
10.1103/PhysRevB.74.012405
PACS:
75.30.−m, 62.65.+k, 64.75.+g, 78.47.+p
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