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A-Site Ordering versus Electronic Inhomogeneity in Colossally Magnetoresistive Manganite Films
Physical Review Letters
Epitaxial La3/4Ca1/4MnO3/MgO(100) (LCMO) thin films show unusual rhombohedral (R-3c) structure with a new perovskite superstructure due to unique ordering of La and Ca at the A-site positions. Very sharp insulator-metal and para-ferromagnetic phase transitions at temperatures up to TMI ~ TC=295 K were observed. The ordered films were electronically homogeneous down to 1 nm scale as revealed by scanning tunnelling microscopy/spectroscopy. In contrast, orthorhombic and A-site disordered LCMOdoi:10.1103/physrevlett.97.107205 pmid:17025850 fatcat:hhvyitokvbad3ibzbszunq75f4