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000887898 1001_ $$0P:(DE-Juel1)169442$$aSchöffmann, P.$$b0$$eCorresponding author
000887898 245__ $$aTuning the Co/Sr stoichiometry of SrCoO$_{2.5}$ thin films by RHEED assisted MBEgrowth
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000887898 520__ $$aStrontium cobaltite (SrCoO2.5+δ, SCO) is a fascinating material because of its topotactic structural phase transition caused by a change in oxygen stoichiometry. In the brownmillerite phase (δ = 0) it is an insulating antiferromagnet whereas in the perovskite phase (δ = 0.5) it is a conducting ferromagnet. In contrast, the impact of the varying Co/Sr stoichiometry on the structure has not yet been studied in SCO thin films. Using molecular beam epitaxy we have fabricated SCO thin films of varying Co/Sr stoichiometry. Films with Co excess exhibit a brownmillerite crystal structure with CoO precipitates within the thin film and on the surface. Co deficient films are amorphous. Only for 1:1 stoichiometry a pure brownmillerite structure is present. We find a clear dependence of the Reflection High Energy Electron Diffraction (RHEED) pattern of these thin films on the stoichiometry. Interestingly, RHEED is very sensitive to a Co excess of less than 12% while x-ray diffraction fails to reveal that difference. Hence, using RHEED, the stoichiometry of SCO can be evaluated and tuned in-situ to a high degree of precision, which allows for a quick adjustment of the growth parameters during a sample series.
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000887898 7001_ $$0P:(DE-Juel1)142052$$aPütter, S.$$b1
000887898 7001_ $$0P:(DE-Juel1)128631$$aSchubert, Jürgen$$b2
000887898 7001_ $$0P:(DE-Juel1)128648$$aZander, W.$$b3
000887898 7001_ $$0P:(DE-Juel1)130525$$aBarthel, J.$$b4
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000887898 773__ $$0PERI:(DE-600)2760382-9$$a10.1088/2053-1591/abc58b$$p116404$$tMaterials Research Express$$v7$$x2053-1591$$y2020
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