La-site shift as probe for Jahn-Teller effect

Bas B. van Aken; Auke Meetsma; Thomas T. M. Palstra

La-site shift as probe for Jahn-Teller effect

Strongly Correlated Electrons 2007-05-23 v1

Authors: Bas B. van Aken , Auke Meetsma , Thomas T. M. Palstra

Abstract

We observe two consecutive transitions in La1-xCaxMnO3, x=0.19: ferromagnetic ordering at Tc = 177 K and Jahn-Teller orbital ordering at T_JT = 150 K. The presence of a ferromagnetic insulating state below T_JT shows that the metallic phase is bound by ferromagnetic and Jahn- Teller ordering, and not induced by a critical doping concentration. The A-site shift is found to be a good indicator of Jahn-Teller ordering. Furthermore, the A-site shift does not disapppear above T_JT, indicating a dynamical behaviour of the distorted MnO6 octahedra.

Keywords

manganites phase transitions magnetic structure

Cite

@article{arxiv.cond-mat/0105197,
  title  = {La-site shift as probe for Jahn-Teller effect},
  author = {Bas B. van Aken and Auke Meetsma and Thomas T. M. Palstra},
  journal= {arXiv preprint arXiv:cond-mat/0105197},
  year   = {2007}
}

Comments

4 pages, including 6 figures

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