Transport and photoresponse properties in Pr0.5Ca0.5CoO3/Nb-SrTiO3 heterostructure S. G. Zhao, A. Gu, X. L. Yan, L. M. Hao, Y. Xie, T. Zhang and K. X. Jin EPL, 108 6 (2014) 67007 Published online: 22 January 2015 DOI: 10.1209/0295-5075/108/67007