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Variety of LaSrMnO Structures Induced by Growth Conditions and Laser Irradiation

机译:生长条件和激光辐照诱导的各种LaSrMnO结构

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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 ℃) 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 ℃. The resistivity is shown to be either temperature-independent, p(T) = const, at T < T_(crit), or varies and reaches a maximum p(T) = p_(max), at the Curie temperature T_c. Optical transmission spectra taken at photon energies hω = 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 ℃. 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 ℃ and the rhombohedral matrix with orthorhombic clusters, in the films grown at T_s = 550 - 650 ℃.
机译:研究了钙钛矿状LaSrMnO金属氧化物的晶体相变。当薄膜合成过程中产生的内部应力(在450到730℃之间)产生的内应力在随后的紫外线范围内发射的KrF激光辐照时发生变化(减小或增大)时,就会诱发转变。随着合成温度T_s的增大,在650-670℃时发生了菱形向斜方相的转变。在T

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