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Laboratory of High Tc Superconductivity, Semiconductor Physics Institute, Vilnius, Lithuania
Laboratory of High - Tc Superconductivity, Semiconductor Physics Institute, Vilnius, Lithuania
Fabrication (MS, PLD, MOCVD)of thin films of complex oxides (FM, AFM, FE, HTS), related heterostructures and device structures. The research activity is focussed on the formation of interfaces between various oxides and investigation of electrical transpoert in the oxide heterostructures
In the absence of a dedicated web page we provide the following description of the activity:
The Institute is an independent organization financed by Lithuanian government. The scientific interest of the High-Tc Superconductivity Laboratory headed by Dr. B. Vengalis (team of 8 Ph.Ds and 3 PhD students) is focussed mainly on growth and investigation of thin films and heterostructures composed of complex oxides as highTc superconductors (YBa2Cu3O7), colossal magnetoresistance manganites, highly conducting (LaNiO3, RuO2, In2O3<Sn>) and isolating (SrTiO3, NdGaO3) oxides. The available technologies: DC and RF magnetron sputtering and pulsed laser deposition. Of particular interest is tunneling of spin-polarised electrons through a nanometric barrier layer in heterostructures composed of the ferromagnetic oxides and HTS layers.
The achievements include:
High quality superconducting Y(123) films exhibiting typical jcvalues exceeding 106 A/cm2 (at 78 K) have been prepared by DC magnetron sputtering on lattice-matched perovskite (SrTiO3, NdGaO3) substrates, colossal magnetoresistance manganites and highly conductive indium-tin oxide (ITO) underlayers grown heteroepitaxially on ZrO2(100).
Short (10 to 100 nsec) electrical current pulse- induced S-N switching phenomenon in tape-like superconducting YBaCuO films have been investigated. High power superconducting optoelectronic opening switch generating fast jitter-free voltage step with the amplitude up 200 V has been designed.
High quality HTS/I/FM heterostructures containing superconducting YBa2Cu3O7 layer, ultrathin SrTiO3 insulating Itunnelling barrier and the feromagnetic (FM) La1-xSrxMnO3 films have been fabricated. Superconducting three-terminal spin-polarized injection device (SPQID) based on the HTS/I/FM heterostructure exhibiting current gain below the superconductive transition temperature Tc (=91 K) has been demonstrated.
The group was involved as a member partner in the EU thematic network “Metal oxide multilayers for magnetoelectronic microsystems and nanotechnologies” (MULTIMETOX), and participated in the EU-supported Centre of Excellence Project “Processing, research and application of advanced materials” (PRAMA)
- S.Balevičius, A.Jukna, E.Šatkovskis, O.Kiprijanovič, V.Pyragas, B.Vengalis, V.Lisauskas, F.Anisimovas, R.Butkutė, A.Abrutis and L.Altgilbers, Fast optically triggered superconducting switch for high-power voltage transient generation, Journ. Magn. and Magn. Mater. 211, (2000) 93-97.
- V. Plausinaitienė, A. Abrutis, B. Vengalis, R. Butkute, J.P. Senateur, Z. Saltyte, V. Kubilius. Spin-polarized quasiparticle injection effect in MOCVD-grown YBa2Cu3O7/SrTiO3/La1-xSrxMnO3/heterostructures.Physica C, 351 (2001) 13-16.
- B.Vengalis, V.Jasutis, A.Paulavičius, D.Franukevičius, Bi2Sr2CaCu2O8 layer formed by melt processing in a cleavage slit of MgO crystal, Lith J. Phys., 40 (2000), 419-424.
- B.Vengalis, V. Plaušinaitienė, A.Abrutis, Z.Šaltytė.”CVD-grown YBCO/STO/LSMO heterostructures with underlying YBCO layer", Acta Phys. Pol. A 107 (2005) 286-289