High Temperature Charge-Ordering Fluctuation in Manganites

K. H. Kim; M. Uehara; S-W. Cheong

High Temperature Charge-Ordering Fluctuation in Manganites

Strongly Correlated Electrons 2007-05-23 v1 Materials Science

Authors: K. H. Kim , M. Uehara , S-W. Cheong

Abstract

High temperature (T) studies of La_{1-x}Ca_{x}MnO_{3} show that charge and phonon transport is significantly suppressed in a narrow doping region of x~1/2 and in a wide T range up to 900 K, which accompanies anomalous broadening of x-ray Bragg peaks. Contrarily, ferromagnetic (FM) correlation above Curie T is sharply enhanced at x~3/8. All these observations indicate the presence of short-range charge ordering (CO) correlation at high T, possibly in the form of a FM "zigzag", a small segment of the CE-type CO state. The decoupling and coupling of the FM zigzags for x~3/8 and 1/2, respectively, is consistent with our results.

Keywords

manganites ferromagnetism phonon physics

Cite

@article{arxiv.cond-mat/0004467,
  title  = {High Temperature Charge-Ordering Fluctuation in Manganites},
  author = {K. H. Kim and M. Uehara and S-W. Cheong},
  journal= {arXiv preprint arXiv:cond-mat/0004467},
  year   = {2007}
}

Comments

8 pages with 4 eps figures, submitted to PRL

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