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Perovskite oxides and related materials: recent problems and perspectives Tribute to the career of Prof. Dr. Siegmar Kapphan International workshop Pavia,

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Presentation on theme: "Perovskite oxides and related materials: recent problems and perspectives Tribute to the career of Prof. Dr. Siegmar Kapphan International workshop Pavia,"— Presentation transcript:

1 Perovskite oxides and related materials: recent problems and perspectives Tribute to the career of Prof. Dr. Siegmar Kapphan International workshop Pavia, October 13th-14th Dip. Fisica “A. Volta” Aula dottorato 2nd floor

2 In 1799 Alessandro Volta invented the battery. He was then 54 years old and one of Europe’s most famous physicists. Since 1778 he had been Regius Professor of Experimental Physics at the Pavia University and been running the Physics Laboratory, which has been recently reconstructed. Not only is our Department named after him... but also the unit of measure of potential, which Volta called "tension", is named the "volt".

3 12 full professors 14 associate professors 7 researchers 18 technicians 20 post graduate, PhD and fellowship students Dipartimento di Fisica “A. Volta” Head of Dept (2003-): Prof. C.B. AZZONI Budget ~ 1.3 M€

4 Sources of budget National Grants EU-Int Grants UNIPV Private Companies INFM 1.3 M€ 0.6 M€

5 PHYSICS EDUCATION and PHYSICS HISTORY Group Staff: G. Bonera, F. Bevilacqua, L. Borghi, A. De Ambrosis, L. Falomo, L. Mascheretti, M.C. Garbarino, L. Cardinali *Identification of tools and strategies to support the Physics teaching/learning process *Historical comprehension of the developments of different physical branches QUANTUM INFORMATION THEORY Group Staff: GM D’Ariano, C. Macchiavello, L. Maccone, M. Sacchi, P. Lo Presti, F. Buscemi, G. Chiribella, P. Perinotti Quantum Measuring Devices for Photonics and Quantum Information Entanglement Assisted High Precision Measurements Quantum Teleportation and Quantum Cloning by the optical parametric squeezing process Quantum Properties of Distributed Systems THEORETICAL RESEARCH IN PLASMA PHYSICS Staff: M. Bornatici, O. Maj, N. Bertelli - propagation and absorption of electromagnetic waves in fusion plasmas. - wave propagation in inhomogeneous media: extension of the geometrical optics approximation.

6 PHOTONICS MATERIALS AND NANOSTRUCTURES Staff: A. Stella, G. Guizzetti, F. Marabelli, L.C. Andreani, M. Patrini, M. Galli, M. Belotti, A. Balestreri, D. Gerace, M. Liscidini Photonic crystals and waveguides Metallic and semiconducting nanoparticles in dielectric matrices SiGe Q-dots for integrated optics Si-compatible Q-dots InAs/InGaAs for 1.3 – 1.55 micron III-V structures for photovoltaic applications Electronic and photonic nanostructures: theory

7 Optical Techniques Linear: angle-resolved reflectance & transmittance spectroscopic ellipsometry modulation spectroscopies (photo-, electro- and thermo- reflectance). Nonlinear : Raman scattering luminescence and second-harmonic generation time-resolved spectroscopy

8 MAGNETISM AND SUPERCONDUCTIVITY MAGNETISM AND SUPERCONDUCTIVITY Staff: A. Rigamonti, F. Borsa, P. Carretta, M. Corti, A. Lascialfari, p.i. S. Aldrovandi Post-doc : J. Lago PhD students : E. Micotti, N. Papinutto, M. Filibian, M. Mariani Techniques : Nuclear Magnetic Resonance (NMR, mainly in Solids) Muon Spin Rotation (MUSR) Susceptibility and magnetization (SQUID) Specific heat Magnetic Resonance Imaging (collaborations )

9 Molecular nanomagnets Quantum tunneling of the magnetization (QTM) Motions and structure of flux lines lattice in superconductors Diamagnetic fluctuations above T C in BCS superconductors (MgB 2 ) Low-dimensional quantum antiferromagnets (S=1/2)

10 G. Samoggia; P. Galinetto; E. Giulotto; F. Rossella RAMAN SPECTROSCOPY, PHOTO and THERMO LUMINESCENCE, PHOTO and THERMO CONDUCTIVITY C.B. Azzoni; M.C. Mozzati; D. Maghini EPR & MAGNETIZATION E.R. Mognaschi DIELECTRIC SPECTROSCOPY OXIDES… Para/ferroelectrics High-k materials for sensors applications

11 PEROVSKITE OXIDES Main Activities Phase transitions in mixed oxides based on ABO 3 (KTO, STO, BTO, etc) compounds Structural, electronic and optical properties of intrinsic and impurities defects in ABO 3 Study of the transport phenomena and charge localization due to optical irradiation in ABO 3 compounds

12 Study of self-ordering and of new phase transitions in soft matrices containing interacting degrees of freedom of impurities and Jahn-Teller polarons Doped KTO, KLT, KLTN PHOTO-INDUCED EFFECTS ON PT IN KTO, STO Nano-materials: effect of nanometric scaling on the occurrence and the nature of phase transition in BTO, KTO and STO Photo-polarons in quantum paraelectric perovskite oxides: optical, charge transport, giant dielectric effects, structural transformations and other manifestations

13 Market Applications of Switchable Materials, through 2006 ($ Millions) MARKET FOR SWITCHABLE MATERIALS BUSINESS COMMUNICATIONS COMPANY, INC., 25 Van Zant Street, Norwalk, CT 06855, Switchable materials are broken down into 3 classes of materials, ferroelectrics (FRAM), electrochromics, and materials used for optical switching(liquid crystals, polymers, and integrated chips)

14 Experimental facilities Raman and micro-Raman spectroscopy Optical absorption, PL, TL, PC, TSC Electron Paramagnetic Resonance Hall, Photo-Hall and magneto-optical spectroscopy Static magnetization measurements Dielectric characterization Ellipsometry Electro-optical characterization * Femto-second laser sources *

15 Spectra Physics system composed by a pump laser Millennia, Ti:sapphire oscillators Tsunami emitting 70/130 fs and 1-15 ps nm, fs Optical Parametric Oscillator tunable from 1400 to 1800 nm Regenerative amplifier and OPA SHG & THG, Hyper Rayleigh scatteing Pump & probe techs Laboratory of Nonlinear Optics and Ultrafast Spectroscopy Electronics Department - University of Pavia V. Degiorgio, I. Cristiani, D. Grando, P. Minzioni…

16 Thursday, October 13th 9:30 – 10:00 Workshop Opening – G. Samoggia/P. Galinetto 10:00 – 10:15 Brief survey on the career of Prof. S. Kapphan – V.A. Trepakov 10:15 – 11:10 Spectroscopy of defects in oxidic crystals – S. Kapphan 11:10 – 11:30 Coffee break 11:30 – 12:20 Low temperature structural phase transitions: pedagogical exposition A. Levanyuk 12:30 – 14:00 Lunch 14:00 – 15:00 Ferroelectric functional elements: device concepts, design of thin film properties, challenges in technology and physics – G. Suchanek 15:00 – 15:45 Light-induced defects in SBN:Ce crystals – A. Gubaev 15:45 – 16:00 Coffee break 16:00 – 16:45 Hollow cathode plasma jet deposition technique: principles and application for BST thin films fabrication – Z. Hubicka 16:45 – 17:05 Structural phase transition and photo-charge carrier transport in SrTiO 3 F. Rossella 17:05 – 17:25 Femtosecond laser writing of surface microstructures in LiNbO 3 D. Grando 17:25 – 17:50 Photorefractivity reduction in Hf-doped LiNbO 3 – V. Degiorgio

17 Friday 14th 9:30 – 10:00 Role of defect chemistry on the properties of perovskite oxides: the case of manganites – L. Malavasi 10:00 – 10:45 Photo-polarons in diluted KTa 1-x Nb x O 3 : UV light-induced IR absorption and photoconductivity manifestations – V. Trepakov 10:45 – 11:00 Coffee break 11:00 – 11:45 Spectroscopic ellipsometry: principles and applications to thin perovskite oxides ferroelectric films – A. Deyneka 11:45 – 12:45 What does the theory really say about the critical thickness of ferroelectric films? – A. Levanyuk 13:00 – 14:30 Lunch 14:30 – 16:30 Visit to the laboratories


19 Prof. Paolo Camagni (1929 – 2000)

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