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Relaxation Processes in ZrO2 at High Pressures
I.V. Korionov1, A.N. Trefilova1, A.N. Babushkin1,W. Lojkowski 2, A. Opalinska2
1
Department of Physics, Ural State University, Ekaterinburg, Russia
2
High Pressure Research Center, Polish Academy of Science, Warsaw, Poland
Morphology, Structural and Absorption Studies on Gallium Nitride Powder
M. Nyk1, W. Stręk2, J. M. Jabłoński2, J. Misiewicz1
1Institute of Physics, Wroclaw University of Technology, Wroclaw, Poland
2Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland
Synthesis and Luminescence Properties of Nanocrystalline BaTiO3:Nd3+ Obtained by Sol-gel Method
R. P±zik, D. Hreniak, W. Stręk
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland
Analysis of Optical Transitions of Nd3+ in YAG Nanocrystallites
A. Bednarkiewicz
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland
Photochromic Sol-Gel Derived Hybrid Polymer Coatings: Influence of Matrix Properties on Kinetics and Photodegradation
A. Klukowska1, U. Posset1, G. Schottner1,
A. Jankowska-Frydel2, V. Malatesta3
1Fraunhofer-Institut Silicatforschung (ISC), Wuerzburg, Germany
2Institute of Experimental Physics, Gdańsk University, Gdańsk, Poland
3Cytec Industries Inc., Stamford, Connecticut, USA
Development of Righly Transparent and Conducting Yttrium Doped ZnO Film: Role of Sol-gel Stabilizers
R. Kaur, A.V. Singh and R.M. Mehra
Department of Electronic Science, University of Delhi South Campus, New Delhi, India
Optical Properties of Eu (III) Doped Nanocrystalline Films of TiO2
A. Hreniak1, M. Nyk2, D. Hreniak3, W. Stręk3, L. Kepiński3, J. Misiewicz2,K. Maruszewski1,3
1
Institute of Materials Science and Applied Mechanics, Wrocław University of Technology, Wroclaw, Poland
2
Institute of Physics, Wrocław University of Technology, Wrocław, Poland
3
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland
Remarks on the Phase Diagram of High Temperature Superconductors: Pressure Dependence
J. Stankowski1, M. Krupski1, R. Micnas2
1
Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland
2
Institute of Physics, Adam Mickiewicz University, Poznań, Poland
Abstract
The Tc(x) dependence in the phase diagram of high temperature superconductors (HTSC) shows that the superconductivity occurs above a critical concentration x1, then Tc increases up to an optimal concentration xopt and with further increase of x, Tc drops. This general feature of HTSC makes its phase diagram still is a subject of intense studies. Above xopt, in the overdoped region there exists a single Tc, which can be taken as the temperature of the Cooper pairs (CP) formation and simultaneously their condensation (BEC) to the superconducting state (SC). For the carrier concentration below the optimal one x < xopt there are two characteristic temperatures, T* > Tc. At T* phase incoherent local pairs (LP's) are formed and only at Tc the system undergoes the superconducting phase transition. The existence of these two characteristic temperatures, T* and Tc, reflects various phenomena related to strong electron correlations.
We review the pressure effects in the cuprate family YBCO and propose their explanation within the Hubbard model description and crossover from BCS cooperative pairing to Bose-Einstein (BEC) of preformed pairs. The scaling of the pressure effects above and below the optimal concentration xopt, is analyzed in terms of the two parameters: the transfer integral t and on-site energy U. With increasing pressure t increases and the density of states at the Fermi level decreases. Above xopt, Tc 1 1/2zt and dTc/dp < 0. However, below xopt, the derivative dTc/dp > 0, since Tc 1 t2/U.
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Download article (PDF)Investigations The Surface Morphology of Al2O3 Layers By Atomic Force Microscopy
W. Skoneczny1, J. Jurusik2, A. Burian3
1
Chair of Materials Science, University of Silesia, Sosnowiec, Poland
2
Centre of Polymer Chemistry, Polish Academy of Sciences, Zabrze, Poland
3
Institute of Physics, University of Silesia, Katowice, Poland
Effect of Double Substituted m-barium Hexaferrites on The Microwave Absorption Properties
R. da Costa Lima1,2, M.S. Pinho1,3, M.L. Gregori1, R.C. Reis Nunes3 and T. Ogasawara2
1
Instituto de Pesquisas da Marinha, Rio de Janeiro, RJ, Brazil
2
Engenharia Metalúrgica da Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
3
Instituto de Macromoléculas (IMA) da Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
Nuclear Complexes with Macrocyclic Ligands. Variation of Magnetic Exchange Interaction in Some of Heteronuclear Thiocyanato--Bridged Compounds
A. Tomkiewicz, J. Kłak, J. Mrozinski
Faculty of Chemistry, University of Wroclaw, Wrocław, Poland
