NDLI: Phase transitions in the atomic, electronic, and magnetic subsystems of LaSrMnO films versus the synthesis temperature

Content Provider	Springer Nature Link
Author	Samoilenko, Z. A. Okunev, V. D. Pushenko, E. I. Pafomov, N. N. Szymczak, R. Baran, M. Lewandowski, S. J.
Copyright Year	2006
Abstract	The evolution of the cluster structure in amorphous LaSrMnO films as synthesis temperature T $_{s}$ increases from 20 to 300°C is considered. Two order-disorder phase transitions with different scale parameters are observed. One of them, the aggregation of disordered atoms into small (∼20 Å) amorphous clusters at T $_{s}$ = 100°C, shows up as a sharp increase in the intensity of diffuse X-ray scattering (diffuse halo 1) with a simultaneous suppression of incoherent (background) scattering. At T $_{s}$ > 150°C, disordering dominates (I $_{incoh}$ = I $_{max}$) until the next stage of ordering sets in at T $_{s}$ = 250−300°C. At this stage, the crystalline phase forms from large (>100 Å) crystalline clusters. This amorphous-crystalline phase transition is characterized by the appearance of Debye lines and a reduction of the halo intensity. The structural phase transition to long-range order is accompanied by a decrease in the LaSrMnO resistivity from 10$^{10}$ to 10 Ω cm and a change from the tunneling mechanism of conductivity involving metallic clusters (which is typical of granulated systems) to the hopping mechanism with a hop variable length following the Mott law ρ ∼ exp(T $^{−1/4}$). In the magnetic subsystem, the paramagnetic-ferromagnetic phase transition occurs.
Starting Page	791
Ending Page	798
Page Count	8
File Format	PDF
ISSN	10637842
Journal	Technical Physics
Volume Number	51
Issue Number	6
e-ISSN	10906525
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2006-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics, Fluids, Thermodynamics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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