A-site Ordering versus Electronic Inhomogeneity in CMR-Manganite Films

Details A-site Ordering versus Electronic Inhomogeneity in CMR-Manganite Films A-site Ordering versus Electronic Inhomogeneity in CMR-Manganite Films

2005-12-15

arxiv.org/abs/cond-mat/0512350v2

Physics

Condensed Matter

Strongly Correlated Electrons

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Scientific paper

10.1103/PhysRevLett.97.107205

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 LCMO demonstrate broadened phase transitions as well as mesoscopic phase separation for T<

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