TY - JOUR
KW - Calcium
KW - Electric fields
KW - Lanthanum compounds
KW - Ferroelectricity
KW - Antiferromagnetics
KW - Degrees of freedom (mechanics)
KW - Ground state
KW - Semiconductor doping
KW - Modulation
KW - Colossal magnetoresistance
KW - Semiconductor junctions
KW - Electronic conduction
KW - Electronic conductors
KW - Electronic transition
KW - Ferroelectric transition
KW - High-Tc superconductivity
KW - Ionic and electronic conduction
KW - Possible mechanisms
AU - C.-H Yang
AU - J Seidel
AU - S.Y Kim
AU - P.B Rossen
AU - P Yu
AU - M Gajek
AU - Y.H Chu
AU - L.W Martin
AU - M.B Holcomb
AU - Q He
AU - P Maksymovych
AU - N Balke
AU - S.V Kalinin
AU - A.P Baddorf
AU - S.R Basu
AU - M.L Scullin
AU - Ramamoorthy Ramesh
AB - Many interesting materials phenomena such as the emergence of high-Tc superconductivity in the cuprates and colossal magnetoresistance in the manganites arise out of a doping-driven competition between energetically similar ground states. Doped multiferroics present a tantalizing evolution of this generic concept of phase competition. Here, we present the observation of an electronic conductor-insulator transition by control of band-filling in the model antiferromagnetic ferroelectric BiFeO 3 through Ca doping. Application of electric field enables us to control and manipulate this electronic transition to the extent that a p-n junction can be created, erased and inverted in this material. A dome-like feature in the doping dependence of the ferroelectric transition is observed around a Ca concentration of 1/8, where a new pseudo-tetragonal phase appears and the electric modulation of conduction is optimized. Possible mechanisms for the observed effects are discussed on the basis of the interplay of ionic and electronic conduction. This observation opens the door to merging magnetoelectrics and magnetoelectronics at room temperature by combining electronic conduction with electric and magnetic degrees of freedom already present in the multiferroic BiFeO 3. © 2009 Macmillan Publishers Limited. All rights reserved.
BT - Nature Materials
DO - 10.1038/nmat2432
LA - eng
M1 - 6
N1 - cited By 389
N2 - Many interesting materials phenomena such as the emergence of high-Tc superconductivity in the cuprates and colossal magnetoresistance in the manganites arise out of a doping-driven competition between energetically similar ground states. Doped multiferroics present a tantalizing evolution of this generic concept of phase competition. Here, we present the observation of an electronic conductor-insulator transition by control of band-filling in the model antiferromagnetic ferroelectric BiFeO 3 through Ca doping. Application of electric field enables us to control and manipulate this electronic transition to the extent that a p-n junction can be created, erased and inverted in this material. A dome-like feature in the doping dependence of the ferroelectric transition is observed around a Ca concentration of 1/8, where a new pseudo-tetragonal phase appears and the electric modulation of conduction is optimized. Possible mechanisms for the observed effects are discussed on the basis of the interplay of ionic and electronic conduction. This observation opens the door to merging magnetoelectrics and magnetoelectronics at room temperature by combining electronic conduction with electric and magnetic degrees of freedom already present in the multiferroic BiFeO 3. © 2009 Macmillan Publishers Limited. All rights reserved.
PB - Nature Publishing Group
PY - 2009
SP - 485
EP - 493
T2 - Nature Materials
TI - Electric modulation of conduction in multiferroic Ca-doped BiFeO 3 films
VL - 8
SN - 14761122
ER -