Abstract
Crystallographic phase transitions in perovskite-like LaSrMnO metallic oxides are studied. The transitions are induced when internal stresses generated during film synthesis (at temperatures between 450 and 730°C) vary (decrease or increase) upon subsequent irradiation by a KrF laser emitting in the UV range. As the synthesis temperature T s grows, the rhombohedral-to-orthorhombic phase transition occurs at 650–670°C. The resistivity is shown to be either temperature-independent, ρ(T)=const, at T<T crit, or varies and reaches a maximum, ρ(T)=ρmax, at the Curie temperature T c. Optical transmission spectra taken at photon energies ℏω=0.5–2.5 eV exhibit both a high (0.8–0.9) and low (0.1–0.3) transmission coefficient t, depending on the synthesis temperature. As follows from X-ray diffraction data, the laser irradiation causes a phase transition only in LaSrMnO films grown at T s<650°C. Phases of different size scales appear: the long-range-order orthorhombic matrix and mesoscopic-range-order rhombohedral clusters are observed in the films grown at T s=450–550°C and the rhombohedral matrix with orthorhombic clusters, in the films grown at T s=550–650°C.
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Translated from Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 73, No. 2, 2003, pp. 118–124.
Original Russian Text Copyright © 2003 by Samo\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\)lenko, Okunev, Pushenko, D’yachenko, Cherenkov, Gierlowski, Lewandowski, Abal’oshev, Klimov, Szewczyk.
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Samoilenko, Z.A., Okunev, V.D., Pushenko, E.I. et al. Variety of LaSrMnO structures induced by growth conditions and laser irradiation. Tech. Phys. 48, 250–256 (2003). https://doi.org/10.1134/1.1553569
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DOI: https://doi.org/10.1134/1.1553569