Resonant Rutherford backscattering spectrometry and channeling studies on the effect of annealing of La0.67Ca0.33MnO3 epilayers grown on SrTiO3(001) substrates using a facing-target sputtering technique
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AbstractLa-0.6-Ca0.33MnO3 films are known to release oxygen upon vacuum annealing due lattice expansion caused by change of valence state of Mn from Mn4+ to Mn3+. RBS measurements using, O(alpha, alpha) resonance reaction at 3.043 MeV show that oxygen concentration decreases from 60% to 57% in 450 degreesC-vacuum annealed samples. There is also oxygen loss from the SrTiO3 substrate upto a certain depth, The measure of crystalline quality chi(mm) degrades from 5.9% to 10%. A 45degrees in-plane orientation is observed which is due to the dominant presence of [110](0) texture in the epilayer. The measured channeling half width psi(1 2) decreases upon vacuum annealing. In the samples annealed in oxygen at high pressure at 700 degreesC. there is no measurable change in oxygen concentration and chi(mm) improved to 4.4%. psi(1 2) increases upon high pressure oxygen annealing, Our measurements directly show that there is lattice disorder upon vacuum annealing and ordering upon high pressure oxygen annealing and it is the largest for the oxygen lattice sites.
All Author(s) ListSundaravel B, Wilson IH, Luo EZ, Xu JB, Yeung HW, Li H, Yeung CF, Sun JR, Wong HK
Name of ConferenceThe 7th European Conference on Accelerators in Applied Research and Technology
Start Date of Conference21/08/2001
End Date of Conference24/08/2001
Place of ConferenceGUILDFORD
Country/Region of ConferenceGreat Britain
Journal nameNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Proceedings TitleNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume Number188
Pages84 - 89
LanguagesEnglish-United Kingdom
KeywordsLCMO,RBS and channeling,in-plane orientation,lattice distortion,sputter-deposition,epitaxy
Web of Science Subject CategoriesInstruments & Instrumentation;Nuclear Science & Technology;Physics, Atomic, Molecular & Chemical;Physics, Nuclear;Instruments & Instrumentation;Nuclear Science & Technology;Physics;INSTRUMENTS & INSTRUMENTATION;NUCLEAR SCIENCE & TECHNOLOGY;PHYSICS, ATOMIC, MOLECULAR & CHEMICAL;PHYSICS, NUCLEAR

Last updated on 2021-05-05 at 01:44