TUNABLE METALLIC CONDUCTANCE IN FERROELECTRIC NANODOMAINS

1. TUNABLE METALLIC CONDUCTANCE IN FERROELECTRIC NANODOMAINS Peter Maksymovych1, Anna N. Morozovska2,3, Pu Yu4, Eugene A. Eliseev3, Ying-Hao Chu4,5, Ramamoorthy Ramesh4, Arthur P. Baddorf1, and Sergei V. Kalinin1 1Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, Tennessee 2 Institute of Semiconductor Physics, National Academy of Science of Ukraine,41, pr. Nauki, 03028 Kiev, Ukraine 3 Institute for Problems of Materials Science, National Academy of Science of Ukraine,3, Krjijanovskogo, 03142 Kiev, Ukraine 4 Department of Materials Science and Engineering and Department of Physics, University of California, Berkeley, California 5 Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan 30010 Achievement Current Piezo • Continuum models reveal carrier accumulation at tilted ferroelectric domain walls and conduction in correlation with experimental results • It was shown that both metallic and non-metallic conducting entities can co-exist in the same material, depending on ferroelectric topology • First experimental measurement of metal-insulator transition triggered by ferroelectric switching in a wide-bandgapoxide • Metallic conductance demonstrated to be tunable by adjusting the size of ferroelectric nanodomains following polarization reversal • T-dependence of local conductance. • Nanodomains are metallic in stark contrast to macrodomains and domain walls (which behave as electronic insulators) • Simultaneously acquired images of piezoelectric response and current at 2.5 V sample bias, revealing finite conductivity of macroscopic domain walls in PbZr0.2Ti0.8O3. These walls are not metallic. Maksymovych et al., Nano Letters, DOI: 10.1021/nl203349b. Experiments were carried out at the Center for Nanophase Materials Sciences, sponsored by the Division of User Facilities, Office of Basic Energy Sciences, U.S. Department of Energy. SVK was supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division. Material synthesis at Berkeley was partially supported by the SRC-NRI-WINS program as well as by the Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences Division of the U. S. Department of Energy under contract No. DE-AC02-05CH1123.