Enhancement of large magnetoresistances in ruthenocuprates by Ta substitution†
Abstract
An unexpected enhancement of the large negative magnetoresistance (MR) observed in RuSr2Nd0.95Y0.15Ce0.9Cu2O10−δ up to −47% at 4 K and 9 T is evidenced upon dilution of the Ru magnetic order by substitution of Ta for Ru; this enhancement of −MR scales with the cell volume.