Volume 60, Number 5, December 2002
|Page(s)||670 - 676|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 November 2002|
Jahn-Teller effect and stability of the charge-ordered state in x manganites
Structure Research Laboratory, Department of
Materials Science and Engineering University of Science and
Technology of China - Hefei, Anhui, 230026, PRC
2 Laboratory of Internal Friction and Defects in Solids, University of Science and Technology of China - Hefei, Anhui, 230026, PRC
3 Department of Physics, University of Hong Kong - Hong Kong, PRC
Corresponding author: email@example.com
Accepted: 12 September 2002
The longitudinal ultrasonic sound velocity and attenuation, the resistivity, and lattice parameters were studied as a function of temperature from 30 to 300 in x . For all the samples, a dramatic stiffening of the sound velocity below the charge ordering transition temperature was directly driven by distinct changes of the lattice parameters due to the formation of long-range ordering of Jahn-Teller–distorted 6 octahedra. The relative change of the sound velocity below depends on the concentration x and reaches the maximum at x=0.75, implying that the effective strength of the electron-lattice interaction with the Jahn-Teller distortion is the strongest at x=0.75 and hence the charge-ordered state is mostly stabilized near x=0.75 and insensitive to the application of a magnetic field, which is supported by the charge transport properties under high magnetic fields up to 14.
PACS: 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound / 64.70.Kb – Solid-solid transitions / 71.38.-k – Polarons and electron-phonon interactions
© EDP Sciences, 2002
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