Chemically Driven Nanoscopic Magnetic Phase Separation at the SrTiO3(001)/La1‐xSrxCoO3 Interface

Torija, M. A.; Sharma, Manish; Gàzquez, Jaume; Varela, M.; He, Chao; Schmitt, J.; Borchers, J. A.; Laver, Mark; El-Khatib, S.; Leighton, Chris

doi:10.1002/adma.201100417

Cited by 66 publications

(103 citation statements)

References 27 publications

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“…11 O vacancy ordering occurs in the related bulk SCO and high x LSCO compounds, 6,7 and similar superstructures have been found in epitaxial LSCO. [8][9][10][11][18][19][20][21] These superstructures are indicators of O vacancy ordering. In the present set of STO(001)/LSCO samples, we have previously reported direct observation of O content modulation by atomic-resolution electron energy loss spectroscopic imaging.…”

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confidence: 56%

“…For example, interfacial magnetic phase separation occurs in STO(001)/LSCO, driven by accumulation of O vacancies near the substrate. 8 These O vacancies undergo long-range ordering, [8][9][10] somehow related to epitaxial strain. 10 Recently observed consequences of this vacancy ordering/interfacial accumulation include spin-state superlattice formation, 11 induced cation order, 12 and a giant coercivity enhancement.…”

mentioning

confidence: 77%

“…Films were grown by reactive sputtering 8,9,11,15 at 700 • C, with 100 W of DC power, in O 2 and Ar pressures of 20 and 50 mTorr, and with post-deposition cooling in 500 Torr of O 2 . High resolution Cu K α x-ray diffraction (XRD) was performed in wideangle XRD (WAXRD), rocking curve (RC), and reciprocal space mapping (RSM) modes.…”

mentioning

confidence: 99%

“…In STO(001)/LSCO, we find a critical thickness for strain relaxation (t crit ) around 200 Å. 8,9,15 Above this value the SRP increases only slowly, reaching approximately 20% at t ≈ 400 Å. On LAO(001) substrates, t crit is lower (≈75 Å), the SRP reaching larger values of 60%-70% at 400 Å.…”

mentioning

confidence: 99%

“…For STO(001)/LSCO and LAO(001)/LSCO, the (013) reflection was chosen. For STO(110)/LSCO, the fourfold in-plane symmetry is broken, and we chose the (310) and (222) reflections to probe two orthogonal high symmetry in-plane directions ( [1][2][3][4][5][6][7][8][9][10] and [001]). In all cases, white crosses mark the positions of the fully strained (pseudomorphic) and fully relaxed (bulk) LSCO reflections.…”

mentioning

confidence: 99%

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Lattice mismatch accommodation via oxygen vacancy ordering in epitaxial La0.5Sr0.5CoO3-δ thin films

et al. 2013

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The properties of complex oxide films depend sensitively on epitaxial strain. This strain affects bond lengths and angles, and defect types and densities, thus impacting physical properties. In this work we perform detailed characterization of depth-dependent strain in epitaxial La0.5Sr0.5CoO3-δ (LSCO) films on SrTiO3(001), SrTiO3(110), and LaAlO3(001) substrates, combining high resolution x-ray diffraction and scanning transmission electron microscopy, in addition to geometric phase analysis. We elucidate a fundamental link between strain state and O vacancy ordering in LSCO films, where lattice mismatch and crystallographic orientation can be used to manipulate the modulation vector of the long-range vacancy order, thus providing a new approach to tailor the properties of such films.

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