Thermodynamic and electron diffraction signatures of charge and spin ordering in La1 − x CaxMnO3

A. P. Ramirez, P. Schiffer, Sang-Wook Cheong, C. H. Chen, W. Bao, T. T.M. Palstra, P. L. Gammel, D. J. Bishop, B. Zegarski

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Abstract

The large-magnetoresistance compounds La1 − x CaxMnO3 have been studied using specific heat, sound velocity(v), and electron diffraction. For 0.63n ≤ x ≤ 0.67 charge ordering is observed at 260 K and accompanied by a dramatic (> 10%) increase in v. This simultaneous occurrence of electron and lattice ordering features implies extremely strong electron-phonon coupling, known to exist for the octahederally coordinated d4 ion and originating in the Jahn-Teller effect. A dynamic manifestation of this Jahn-Teller coupling has been suggested by Millis et al. as the origin for colossal magnetoresistance.

Original languageEnglish (US)
Pages (from-to)3188-3191
Number of pages4
JournalPhysical review letters
Volume76
Issue number17
DOIs
StatePublished - Apr 22 1996

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Ramirez, A. P., Schiffer, P., Cheong, S-W., Chen, C. H., Bao, W., Palstra, T. T. M., Gammel, P. L., Bishop, D. J., & Zegarski, B. (1996). Thermodynamic and electron diffraction signatures of charge and spin ordering in La1 − x CaxMnO3. Physical review letters, 76(17), 3188-3191. https://doi.org/10.1103/PhysRevLett.76.3188