Orientation-controlled epitaxy and anisotropic properties of La[sub 2-x]Sr[sub x]NiO[sub 4] with 0.5≤x≤1.5 covering the insulator–metal transition

Shinomori, S.; Kawasaki, M.; Tokura, Y.
January 2002
Applied Physics Letters;1/28/2002, Vol. 80 Issue 4, p574
Academic Journal
The a- and c-axis-oriented epitaxial thin films of layered nickelate La[sub 2-x]Sr[sub x]NiO[sub 4] (0.5≤x≤1.5), of which bulk single crystals are not available, were grown on LaSrAlO[sub 4] (100) and (LaAlO[sub 3])[sub 0.3](SrAl[sub 0.5]Ta[sub 0.5]O[sub 3])[sub 0.7] (001) substrates, respectively. Due to the in-plane anisotropy of the lattice mismatch, the lattice parameters of the a-axis-oriented films vary with x in a different manner from those of the ceramics. In the a-axis-oriented films, resistivity, and optical spectra show large anisotropy between the b and c axes, indicating the quasi-two-dimensional nature of the electronic structure in La[sub 2-x]Sr[sub x]NiO[sub 4]. © 2002 American Institute of Physics.


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