Abstract
We have investigated the R-site randomness effect of R/Ba-ordered RBaMn2O6 (R = rare earth) by using Y1−yLayBaMn2O6 (0 ≤ y ≤ 1) in which R (Y,La) and Ba are regularly arranged while Y and La randomly occupy the R-site. YBaMn2O6 (y = 0) undergoes charge/orbital ordering (CO) transition at TCO = 500 K while LaBaMn2O6 (y = 1) shows ferromagnetic metallic (FM) behavior below 350 K. In 0 ≤ y ≤ 0.6, TCO decreases with an increase in y. In 0.6 ≤ y ≤ 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.
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