Structural, magnetic and electronic properties of pulsed-laser-deposition grown SrFeO3−δthin films and SrFeO3−δ/La2/3Ca1/3MnO3multilayers

Perret, Edith; Sen, Kaushik; Khmaladze, Jarji; Mallett, Benjamin P. P.; Yazdi-Rizi, Meghdad; Maršík, Přemysl; Das, Saikat; Marozau, Ivan; Uribe-Laverde, M. A.; Prada, Roberto de Andrés; Strempfer, J.; Döbeli, M.; Biškup, N.; Varela, M.; Mathis, Yves‐Laurent; Bernhard, C.

doi:10.1088/1361-648x/aa93a6

Cited by 5 publications

(3 citation statements)

References 57 publications

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“…Finally we note that we observe similar low-frequency modes in superlattices grown in our laboratory where the YBCO is replaced with another metal oxide. These include SrFeO 3 /La 2/3 Ca 1/3 MnO 3 [50] and SrRuO 3 /La 2/3 Ca 1/3 MnO 3 superlattices.…”

Section: B Sample Dependencementioning

confidence: 99%

Backfolded acoustic phonons as ultrasonic probes in metal-oxide superlattices

Lyzwa

Chan

Khmaladze

et al. 2020

Phys. Rev. Materials

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Ultrasonics have been an incisive probe of internal interfaces in a wide variety of systems ranging from stars to solids. For thin-film structures, however, ultrasound is largely ineffective because the signal is dominated by the substrate. Using confocal Raman spectromicroscopy, we show that multiple reflection of sound waves at internal interfaces of a metal-oxide superlattice generates standing waves that are insensitive to the substrate. Such modes had previously been observed only in high-quality superlattices of elemental semiconductors, and their observation in complex metal-oxide heterostructures is testimony to recent progress in this field. We use the high spatial resolution of the Raman microscope to demonstrate the high sensitivity of the mode frequency to atomic-scale thickness variations of the superlattice. Spectroscopy of acoustic standing waves can hence serve as a powerful characterization tool of thin-film structures. In analogy to ultrasound spectroscopy of bulk solids, lineshape analysis of these modes has the potential to yield detailed information about the internal structure of the interfaces as well as the coupling of sound waves to the low-frequency spin, charge, and orbital dynamics in metal-oxide superlattices.

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Section: B Sample Dependencementioning

confidence: 99%

Backfolded acoustic phonons as ultrasonic probes in metal-oxide superlattices

Lyzwa

Chan

Khmaladze

et al. 2020

Phys. Rev. Materials

View full text Add to dashboard Cite

show abstract

“…We also note that we observe similar low-frequency modes in superlattices grown in our laboratory where the YBCO is replaced for another metal oxide. These include SrFeO 3 /La 2/3 Ca 1/3 MnO 3 40 and SrRuO 3 /La 2/3 Ca 1/3 MnO 3 superlattices.…”

mentioning

confidence: 99%

Backfolded acoustic phonons in metal-oxide superlattices

Lyzwa,

Chan,

Khmaladze

et al. 2019

Preprint

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We report the observation of low-frequency modes in the Raman spectra of thin-film superlattices of the hightemperature superconductor YBa 2 Cu 3 O 7−δ and various manganite perovskites. Our study shows that these modes are caused by the backfolding of acoustic phonons due to the additional periodicity introduced by the superlattice. Such modes were previously only observed for ultra-pure semiconductor superlattices. They can be used to determine the bilayer thickness of the superlattice and its speed of sound. Moreover, we use the spatial resolution of Raman microscopy to map the film thickness inhomogeneity across a sample, making these modes a useful tool to characterize thin-film superlattices.

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“…Finally we note that we observe similar low-frequency modes in superlattices grown in our laboratory where the YBCO is replaced with another metal oxide. These include SrFeO3/La2/3Ca1/3MnO3 [248] and SrRuO3/La2/3Ca1/3MnO3 superlattices.…”

Section: B Sample Dependencementioning

confidence: 99%

Phononic and electronic excitations in complex oxides studied with advanced Infrared and Raman spectroscopy techniques

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Complex oxides with perovskite structure exhibit a rich spectrum of exotic and emergent phases, including superconductivity, spin and charge ordering, ferroelectricity and flexoelectricity. Interestingly, several of these orders can coexist within the same material. A certain phase can be favored over the others by exposing the material to external stimuli. Decreasing the spatial dimensions in these materials to the atomic level, e.g. in the form of thin films, provides an additional control parameter. In this thesis, several oxide-based materials, including the high-temperature superconductor YBa2Cu3O6+x (YBCO) in the form of bulk crystals and as thin films in heterostructures, and the dielectrics SrTiO3 and KTaO3, have been investigated. The measurements were performed as a function of various external stimuli, such as high magnetic or electric fields, temperature and UV-light illumination. Using advanced infrared and Raman spectroscopy techniques, novel experimental results have been obtained on the underlying physical mechanisms that lead to the interesting effects in these materials.

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Structural, magnetic and electronic properties of pulsed-laser-deposition grown SrFeO_3−δthin films and SrFeO_3−δ/La_2/3Ca_1/3MnO₃multilayers

Cited by 5 publications

References 57 publications

Backfolded acoustic phonons as ultrasonic probes in metal-oxide superlattices

Backfolded acoustic phonons as ultrasonic probes in metal-oxide superlattices

Backfolded acoustic phonons in metal-oxide superlattices

Phononic and electronic excitations in complex oxides studied with advanced Infrared and Raman spectroscopy techniques

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