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The detailed behavior of the phase transitions was mapped out for the series RNiO₃ as a function of the rare earth (R). A sharp insulator-metal transition is observed, which depends strongly on R. ForsmallR it occurs at a higher temperature than the antiferromagnetic ordering (measured by muon-spin relaxation). By increasing either the temperature or the size of R, an insulator-metal transition is observed, most probably caused by the closing of the charge-transfer gap, induced by increase in the electronic bandwidth.
Torrance et al. (Wed,) studied this question.
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