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1

Fabrication and Ferroelectric Properties of BiFeO₃/BaTiO₃ Heterostructures

100%

Aleszkiewicz M., Dybko K., Dynowska E., Dluzewski P., Przyslupski P.

Acta Physica Polonica A

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2016

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vol. 130

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issue 2

511-515

EN

We report on preparation and electrical characterization of the epitaxial BaTiO₃ (BTO), BiFeO₃ (BFO) thin films and BFO/BTO bi- and multilayers, grown on (001) SrTiO₃ (STO) and (LaAlO₃)_{0.3}(Sr₂TaAlO₆)_{0.7} (LSAT) substrates. The ferroelectric properties were characterized using the electric force microscopy method to image and switch the electric domains. This fabrication process opens the routes towards wide study of magnetoelectric effect in complex oxide heterostructures.

2

Superconductivity and Ferromagnetism in La_{0.67}Sr_{0.33}MnO₃/YBa₂Cu₃O₇ Nanosized Heterostructures

100%

Lochmajer H., Matusiak M., Urbanik G., Przyslupski P., Rogacki K.

Acta Physica Polonica A

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2016

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vol. 130

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issue 2

588-592

EN

In this work we present recent experimental studies of heterostructures composed of ferromagnetic La_{0.67}Sr_{0.33}MnO₃ (LSMO) and superconducting YBa₂Cu₃O₇ (YBCO) multilayers grown by dc sputtering method. The transport and magnetic properties of the large set of heterostructures were investigated in a wide temperature range from 2 to 400 K and in fields up to 12.5 T. The resistivity and the upper critical field were measured for samples with the plane active dimensions 1.5× 5 mm². The Nernst effect was studied in the mixed state revealing the characteristic temperature dependence of the Nernst signal which was correlated with variation of the upper critical field. We have observed an influence of the magnetic LSMO layer on the superconducting properties of the adjacent YBCO layer which consists in a substantial reduction of the superconducting critical temperature and a small lowering of the upper critical field.

3

Signature of the Spin Triplet Phase in La_{0.7}Sr_{0.3}MnO_3/Yba_2Cu_3O_7/La_{0.7}Sr_{0.3}MnO_3 Trilayers

86%

Przyslupski P., Dybko K., Werner-Malento K., Aleshkevych P., Wojcik M., Sawicki M.

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issue 2

313-315

EN

Differential dynamical subgap transport measurements were performed on LSMO/YBCO/LSMO trilayers to probe local evolution of the Andreev bound states which are manifested as the zero bias conductance peak. Dynamical conductivity dI/dV vs. magnetic field measured in current in plane and current perpendicular to plane geometries show nonmonotonic behavior with maximum at about 500 Oe. The shape of the zero bias conductance peak measured in current in plane geometry is sharp, whereas zero bias conductance peak measured in current perpendicular to plane geometry demonstrates V shape. These shapes of the zero bias conductance peak were predicted theoretically for unconventional p-wave spin triplet phase superconductor and superconductor with d-wave symmetry of the order parameter, respectively.

4

Barrier and Self-Energy Effects in Manganite Tunneling Characteristics

73%

Svistunov V., Revenko Y., Belogolovskii M., Gerasimenko A., Pashkevich Y., Szymczak H., Przyslupski P., Komissarov I.

Acta Physica Polonica A

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2004

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vol. 105

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issue 1-2

87-92

EN

Tunneling conductance spectra of point-contact junctions formed by a sharp Ag tip and two optimally doped manganites La_{0.67}Sr_{0.33}MnO_3 and Nd_{0.67} Sr_{0.33}MnO_3 are measured and analyzed. It was found that the analytical dependence of the differential conductance on voltage strongly depends on the bias sign and dramatically changes after voltage treatments. The data obtained are explained in terms of the Glasman-Matveev model for tunneling across two localized states settled in the barrier near the manganite bulk. Effective functions of electron-boson interaction extracted from self-energy contributions to the experimental characteristics contain signs of phonon and magnon excitations, higher-energy satellites as a result of possible orbital ordering and a hallmark of localized states in the near-barrier region in the form of strong not-well reproduced peaks.

5

Structure and Magnetic Characterization οf BiFeO_3/YBa_2Cu_3O_7 Bilayers

73%

Werner-Malento K., Tsarou A., Dluzewski P., Paszkowicz W., Minikayev R., Sawicki M., van der Beek K., Konczykowski M., Przyslupski P.

Acta Physica Polonica A

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2009

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vol. 115

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issue 1

95-97

EN

Bilayered epitaxial BiFeO_3/YBa_2Cu_3O_7 films were fabricated on (100) [(LaAlO_3)_{0.3}(Sr_2TaAlO_6)_{0.7}] substrates by sputtering method. For structural comparison the bilayered BiFeO_3/La_{0.67}Sr_{0.33}MnO_3 films were also deposited on (100) SrTiO_3 substrates. A weak ferromagnetic moment is observed in BiFeO_3/YBa_2Cu_3O_7 films. The mechanism responsible for weak ferromagnetic moment arises presumably from the epitaxy strain induced canted antiferromagnetic structure.

6

Multifunctional La_{0.7}Sr_{0.3}MnO_3-YBa_2Cu_3O_7 Heterostructures

73%

Przyslupski P., Dybko K., Tsarou A., Werner-Malento K., Sawicki M., Laviano F., Gozzellino L., Mezzetti E.

Acta Physica Polonica A

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2008

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vol. 114

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issue 1

15-22

EN

Complex perovskite oxides exhibit a rich spectrum of functional responses such as: superconductivity, magnetism etc. Combination of different oxides in multilayered structures increases the number of physical responses. Heterogeneous oxide structures represent a new class of nanostructures. They consist of ferromagnetic La_{0.67}Sr_{0.33}MnO_3 (F-LSMO) manganite and superconducting YBa_2Cu_3O_7 (Sc-YBCO) cuprate. The interaction between the two order parameters gives rise to new physical effects. In this review we will discuss various physical effects obtained in the bilayer and trilayer heterostructures. For example, the LSMO/YBCO bilayer structures are used to study the mechanism of magnetic pinning. The other possibility is the fabrication of spin valve-like structures LSMO/YBCO/LSMO. The spin dependent transport in trilayer structure was studied taking into account crossed Andreev reflection and electron co-tunneling processes.

Refine search results

Fabrication and Ferroelectric Properties of BiFeO₃/BaTiO₃ Heterostructures

Superconductivity and Ferromagnetism in La_{0.67}Sr_{0.33}MnO₃/YBa₂Cu₃O₇ Nanosized Heterostructures

Signature of the Spin Triplet Phase in La_{0.7}Sr_{0.3}MnO_3/Yba_2Cu_3O_7/La_{0.7}Sr_{0.3}MnO_3 Trilayers

Barrier and Self-Energy Effects in Manganite Tunneling Characteristics

Structure and Magnetic Characterization οf BiFeO_3/YBa_2Cu_3O_7 Bilayers

Multifunctional La_{0.7}Sr_{0.3}MnO_3-YBa_2Cu_3O_7 Heterostructures