$R$-site Randomness Effect in Double-Perovskite $R$BaMn$_{2}$O$_{6}$

Y. Miyauchi; S. Fukushima; J. Tozawa; M. Akaki; H. Kuwahara; D. Akahoshi

doi:10.1088/1742-6596/200/1/012123

$R$-site Randomness Effect in Double-Perovskite $R$BaMn$_{2}$O$_{6}$

Strongly Correlated Electrons 2015-05-14 v1

Authors: Y. Miyauchi , S. Fukushima , J. Tozawa , M. Akaki , H. Kuwahara , D. Akahoshi

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Abstract

We have investigated the $R$ -site randomness effect of $R$ /Ba-ordered $R$ BaMn $_{2}$ O $_{6}$ ( $R$ = rare earth) by using Y $_{1-y}$ La $_y$ BaMn $_2$ O $_6$ (0 (\leq) $y$ (\leq) 1) in which $R$ (Y,La) and Ba are regularly arranged while Y and La randomly occupy the $R$ -site. YBaMn $_2$ O $_6$ ( $y$ = 0) undergoes charge/orbital ordering (CO) transition at $T_{\rm CO}$ = 500 K while LaBaMn $_{2}$ O $_{6}$ ( $y$ = 1) shows ferromagnetic metallic (FM) behavior below 350 K\@. In 0 (\leq) $y$ (\leq) 0.6, $T_{\rm CO}$ decreases with an increase in $y$ . In 0.6 (\leq) $y$ (\leq) 0.8, $R$ -site randomness causes strong phase separation tendencies among the FM, antiferromagnetic (AFM), and CO insulating (COI) states. The large magnetoresistance is observed in the phase separated region.

Keywords

double perovskite R-site randomness charge/orbital ordering ferromagnetic metallic phase separation magnetoresistance YBaMn2O6 LaBaMn2O6

Cite

@article{arxiv.0909.1429,
  title  = {$R$-site Randomness Effect in Double-Perovskite $R$BaMn$_{2}$O$_{6}$},
  author = {Y. Miyauchi and S. Fukushima and J. Tozawa and M. Akaki and H. Kuwahara and D. Akahoshi},
  journal= {arXiv preprint arXiv:0909.1429},
  year   = {2015}
}

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4 pages, 2 figures, proceeding of International Conference on Magnetism 2009

$R$-site Randomness Effect in Double-Perovskite $R$BaMn$_{2}$O$_{6}$

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