Connecting bulk symmetry and orbital polarization in strained RNiO3 ultrathin films

Connecting bulk symmetry and orbital polarization in strained RNiO3 ultrathin films I. C. Tung,1,2,* P. V. Balachandran,3 Jian Liu,4,5,† B. A. Gray,4 E. A. Karapetrova,1 J. H. Lee,1 J. Chakhalian,4 M. J. Bedzyk,2 J. M. Rondinelli,3 and J. W. Freeland1,‡ 1Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA 2Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA 3Department of Materials Science & Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA 4Department of Physics, University of Arkansas, Fayetteville, Arkansas 70701, USA 5Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA (Received 22 February 2013; revised manuscript received 10 October 2013; published 12 November 2013)