A distorted delafossite CuMnO2, called crednerite, was formed into epitaxial thin films on MgAl2 O4 (111) substrates by pulsed laser deposition method. X-ray diffraction revealed that the films had high crystalline quality with epitaxial relationship of CuMnO2 (001) // MgAl2 O4 (111) and CuMnO2  // MgAl 2 O4 〈11-2〉. The ultraviolet-visible optical response revealed a distinct absorption peak at 4.5 eV presumably with excitonic nature and broad peaks at 3.0 and 3.7 eV assignable to O 2p-Mn 3d charge transfer excitation. Small magnetic hysteresis with remanent magnetization of 0.04 μB/Mn was observed below 20 K, representing canted antiferromagnetic spin ordering.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)