M\"{o}ssbauer study of Na$_{0.82}$CoO$_2$ (doped by 1% $^{57}$Fe)

M. Pissas; V. Psycharis; D. Stamopoulos; G. Papavassiliou; Y. Sanakis; A. Simopoulos

M\"{o}ssbauer study of Na$_{0.82}$CoO$_2$ (doped by 1% $^{57}$Fe)

Superconductivity 2007-05-23 v1 Strongly Correlated Electrons

Authors: M. Pissas , V. Psycharis , D. Stamopoulos , G. Papavassiliou , Y. Sanakis , A. Simopoulos

Abstract

We studied by M\"{o}ssbauer spectroscopy the Na $_{0.82}$ CoO $_2$ compound using 1% $^{57}$ Fe as a local probe which substitutes for the Co ions. M\"{o}ssbauer spectra at T=300 K revealed two sites which correspond to Fe $^{3+}$ and Fe $^{4+}$ . The existence of two distinct values of the quadrupole splitting instead of a continuous distribution should be related with the charge ordering of Co $^{+3}$ , Co $^{+4}$ ions and ion ordering of Na(1) and Na(2). Below T=10 K part of the spectrum area, corresponding to Fe $^{4+}$ and all of Fe $^{3+}$ , displays broad magnetically split spectra arising either from short-range magnetic correlations or from slow electronic spin relaxation.

Keywords

Mossbauer spectroscopy NaCoO2 charge ordering magnetic ordering iron doping

Cite

@article{arxiv.cond-mat/0503662,
  title  = {M\"{o}ssbauer study of Na$_{0.82}$CoO$_2$ (doped by 1% $^{57}$Fe)},
  author = {M. Pissas and V. Psycharis and D. Stamopoulos and G. Papavassiliou and Y. Sanakis and A. Simopoulos},
  journal= {arXiv preprint arXiv:cond-mat/0503662},
  year   = {2007}
}

M\"{o}ssbauer study of Na$_{0.82}$CoO$_2$ (doped by 1% $^{57}$Fe)

Abstract

Keywords

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