Optical and magnetic properties of CuMnO2 epitaxial thin films with a delafossite-derivative structure

Hiraga, H.; Fukumura, T.; Ohtomo, A.; Makino, T.; Ohkubo, A.; Kimura, H.; Kawasaki, M.
July 2009
Applied Physics Letters;7/20/2009, Vol. 95 Issue 3, p032109
Academic Journal
A distorted delafossite CuMnO2, called crednerite, was formed into epitaxial thin films on MgAl2O4 (111) substrates by pulsed laser deposition method. X-ray diffraction revealed that the films had high crystalline quality with epitaxial relationship of CuMnO2 (001)//MgAl2O4 (111) and CuMnO2 [100]//MgAl2O4 <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 0.04μB/Mn was observed below 20 K, representing canted antiferromagnetic spin ordering.


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