%0 Journal Article %K Calcium %K Electric fields %K Lanthanum compounds %K Ferroelectricity %K Antiferromagnetics %K Degrees of freedom (mechanics) %K Ground state %K Semiconductor doping %K Modulation %K Colossal magnetoresistance %K Semiconductor junctions %K Electronic conduction %K Electronic conductors %K Electronic transition %K Ferroelectric transition %K High-Tc superconductivity %K Ionic and electronic conduction %K Possible mechanisms %A C.-H Yang %A J Seidel %A S.Y Kim %A P.B Rossen %A P Yu %A M Gajek %A Y.H Chu %A L.W Martin %A M.B Holcomb %A Q He %A P Maksymovych %A N Balke %A S.V Kalinin %A A.P Baddorf %A S.R Basu %A M.L Scullin %A Ramamoorthy Ramesh %B Nature Materials %D 2009 %G eng %I Nature Publishing Group %P 485-493 %R 10.1038/nmat2432 %T Electric modulation of conduction in multiferroic Ca-doped BiFeO 3 films %V 8