Elastically strained and relaxed La0.67Ca0.33MnO3 films grown on lanthanum aluminate substrates with different orientations

Structure of 40-nm thick La0.67Ca0.33MnO3 (LCMO) films grown by laser evaporation on (001) and (110) LaAlO3 (LAO) substrates has been investigated using the methods of medium-energy ion scattering and X-ray diffraction. The grown manganite layers are under lateral biaxial compressive mechanical stresses. When (110)LAO wafers are used as the substrates, stresses relax to a great extent; the relaxation is accompanied by the formation of defects in a (3-4)-nm thick manganite-film interlayer adjacent to the LCMO-(110)LAO interface. When studying the structure of the grown layers, their electro- and magnetotransport parameters have been measured. The electroresistance of the LCMO films grown on the substrates of both types reached a maximum at temperature T (M) of about 250 K. At temperatures close to T (M) magnetoresistance of the LCMO/(110)LAO films exceeds that of the LCMO/(001)LAO films by 20-30%; however, the situation is inverse at low temperatures (T < 150 K). At T < T (M) , the magnetotransport in the grown manganite films significantly depends on the spin ordering in ferromagnetic domains, which increase with a decrease in temperature.

Serenkov, I.T.Russian Academy of Sciences (författare)
Sakharov, V.I.Russian Academy of Sciences (författare)
Claeson, Tord,1938Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)f4atc (författare)
Russian Academy of SciencesChalmers tekniska högskola (creator_code:org_t)

Ingår i:Physics of the Solid State: Pleiades Publishing Ltd58:12, s. 2560-25661063-78341090-6460

Av författaren/redakt...: Boikov, Y. A.; Serenkov, I.T.; Sakharov, V.I.; Claeson, Tord, 1 ...

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