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Université de Fribourg

High‐ TC interfacial ferromagnetism in SrMnO 3 LaMnO 3 superlattices

Keunecke, Marius ; Lyzwa, Fryderyk ; Schwarzbach, Danny ; Roddatis, Vladimir ; Gauquelin, Nicolas ; Müller‐Caspary, Knut ; Verbeeck, Johann ; Callori, Sara J. ; Klose, Frank ; Jungbauer, Markus ; Moshnyaga, Vasily

In: Advanced Functional Materials, 2020, vol. 30, no. 18, p. 1808270

Heterostructures of strongly correlated oxides demonstrate various intriguing and potentially useful interfacial phenomena. LaMnO3/SrMnO3 superlattices are presented showcasing a new high‐temperature ferromagnetic phase with Curie temperature, T C ≈360 K, caused by electron transfer from the surface of the LaMnO3 donor layer into the neighboring SrMnO3 acceptor layer. As a result, the...

Université de Fribourg

Backfolded acoustic phonons as ultrasonic probes in metal-oxide superlattices

Lyzwa, Fryderyk ; Chan, A. ; Khmaladze, Jarji ; Fürsich, K. ; Keimer, B. ; Bernhard, Christian ; Minola, M. ; Mallett, Benjamin P. P.

In: Physical Review Materials, 2020, vol. 4, no. 4, p. 043606

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...

Université de Fribourg

Magneto-transport in La2/3Sr1/3MnO3/YBa2Cu3O7/Alq3/Co spin-valves

Cerreta, Andrea ; Gaina, Roxana ; Nuccio, Laura ; Marozau, Ivan ; Sen, Kaushik ; De Andrés Prada, Roberto ; Sarkar, Subhrangsu ; Bernhard, Christian

In: EPL (Europhysics Letters), 2020, vol. 129, no. 3, p. 37002

We studied how an additional layer of the high superconductor YBCO affects the magneto-transport across a LSMO/Alq3/Co spin-valve structure. We found that up to a thickness of at least 10 nm the YBCO layer on top of LSMO hardly changes the spin-valve effect, since the device resistance still depends on the relative orientation of the LSMO and Co magnetization. The spin-valve effect persists...

Université de Fribourg

Growth and nanofabrication of all-perovskite superconducting/ferromagnetic/superconducting junctions

Andrés Prada, Roberto de ; Golod, T. ; Bernhard, Christian ; Krasnov, V. M.

In: Journal of Superconductivity and Novel Magnetism, 2019, vol. 32, no. 9, p. 2721–2726

We fabricate and study experimentally all-perovskite-oxide superconductor/ferromagnetic insulator/superconductor (S/FI/S) tunnel junctions made out of the high-temperature cuprate superconductor YBa2Cu3O7−y (YBCO) and the colossal magnetoresistive manganite LaMnO3 (LMO) in the ferromagnetic insulator state. YBCO/LMO/YBCO heterostructures with different LMO thicknesses (5, 10, and 20 nm)...

Université de Fribourg

Controlling the strength of ferromagnetic order in YBa2Cu3O7/La2/3Ca1/3MnO3 multilayers

Andrés Prada, Roberto de ; Gaina, Roxana ; Biškup, N. ; Varela, M. ; Stahn, J. ; Bernhard, Christian

In: Physical Review B, 2019, vol. 100, no. 11, p. 115129

With dc magnetization and polarized neutron reflectometry we studied the ferromagnetic response of YBa2Cu3O7/La2/3Ca1/3MnO3 (YBCO/LCMO) multilayers that are grown with pulsed laser deposition. We found that whereas for certain growth conditions (denoted as A type) the ferromagnetic moment of the LCMO layer is strongly dependent on the structural details of the YBCO layer on which it is ...

Université de Fribourg

Memory-functionality superconductor/ferromagnet/superconductor junctions based on the high- T c cuprate superconductors YBa 2 Cu 3 O 7 − x and the colossal magnetoresistive manganite ferromagnets La 2 / 3 X 1 / 3 MnO 3 + δ ( X = Ca , Sr )

Andrés Prada, R. de ; Golod, T. ; Kapran, O. M. ; Borodianskyi, E. A. ; Bernhard, Christian ; Krasnov, V. M.

In: Physical Review B, 2019, vol. 99, no. 21, p. 214510

Complex oxides exhibit a variety of unusual physical properties, which can be used for designing novel electronic devices. Here we fabricate and study experimentally nanoscale superconductor/ferromagnet/superconductor junctions with the high-Tc cuprate superconductors YBa2Cu3O7−x and the colossal magnetoresistive (CMR) manganite ferromagnets La2/3X1/3MnO3+δ (X=Ca or Sr). We demonstrate...

Université de Fribourg

Granular superconductivity and charge/orbital order in YBa 2 Cu 3 O 7 /manganite trilayers

Khmaladze, Jarji ; Sarkar, Subhrangsu ; Soulier, Mathias ; Lyzwa, Fryderyk ; Prada, R. de Andres ; Perret, Edith ; Mallett, Benjamin P. P. ; Minola, M. ; Keimer, B. ; Bernhard, Christian

In: Physical Review Materials, 2019, vol. 3, no. 8, p. 084801

We studied how the electronic, superconducting, and magnetic properties of YBa2Cu3O7/Nd1−x(Ca1−ySry )xMnO3 multilayers depend on the tolerance factor and the hole doping of the manganite. In particular, we investigated the granular superconducting state and the related magnetic-field-driven insulator-to- superconductor transition that was previously discovered in corresponding multilayers...

Université de Fribourg

Possible light-induced superconductivity in a strongly correlated electron system

Bittner, Nikolaj ; Tohyama, Takami ; Kaiser, Stefan ; Manske, Dirk

In: Journal of the Physical Society of Japan, 2019, vol. 88, no. 4, p. 044704

Using a nonequilibrium implementation of the Lanczos-based exact diagonalisation technique we study the possibility of the light-induced superconducting phase coherence in a solid state system after an ultrafast optical excitation. In particular, we investigate the buildup of superconducting correlations by calculating an exact time- dependent wave function reflecting the properties of the...

Université de Fribourg

Systematic analysis of synergistic proteome modulations in a drug combination of cisplatin and MLN4924

Megger, Dominik Andre ; Abou-Eid, Shadi ; Zülch, Birgit ; Sitek, Barbara

In: Molecular Omics, 2018, vol. 14, no. 6, p. 450–457

Chemotherapeutic treatment regimens often take advantage of synergistic effects of drug combinations. Anticipating that synergistic effects on the cell biological level likely manifest on the proteome level, the analysis of proteome modulations represents an appropriate strategy to study drug combinations on a molecular level. More specifically, the detection of single proteins exhibiting...