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

Perovskite oxides and related materials: recent problems and perspectives

Tribute to the career of Prof. Dr. Siegmar Kapphan

International workshop Pavia, October 13th-14thDip. Fisica “A. Volta” Aula dottorato2nd floor

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".

http://ppp.unipv.it

12 full professors

14 associate professors

7 researchers

18 technicians

20 post graduate, PhD and fellowship students

Dipartimento di Fisica “A. Volta”Dipartimento di Fisica “A. Volta”Head of Dept (2003-): Prof. C.B. AZZONIHead of Dept (2003-): Prof. C.B. AZZONI

Budget ~ 1.3 M€

Sources of budget

2004

0%7%

8%

35%

50%

National GrantsEU-Int GrantsUNIPVPrivate CompaniesINFM

1.3 M€

20%

0%45%

10%25%

1995

0.6 M€

PHYSICS EDUCATION and PHYSICS HISTORY GroupStaff: 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 GroupStaff: 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 SystemsTHEORETICAL 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.

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 laser @ 1.3 – 1.55 micron

• III-V structures for photovoltaic applications

•Electronic and photonic nanostructures: theory

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

MAGNETISM AND MAGNETISM AND SUPERCONDUCTIVITYSUPERCONDUCTIVITY

Staff: A. Rigamonti, F. Borsa, P. Carretta, M. Corti, A. Lascialfari, p.i. S. AldrovandiPost-doc : J. LagoPhD 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)

Molecular nanomagnetsMolecular nanomagnets

Quantum tunneling of the magnetization Quantum tunneling of the magnetization (QTM)(QTM)

Motions and structure of flux lines Motions and structure of flux lines lattice in superconductorslattice in superconductors

Diamagnetic fluctuations above TDiamagnetic fluctuations above TCC in BCS in BCS superconductors (MgBsuperconductors (MgB22))

Low-dimensional Low-dimensional quantum antiferromagnets (S=1/2) quantum antiferromagnets (S=1/2)

G. Samoggia; P. Galinetto; E. Giulotto; F. G. Samoggia; P. Galinetto; E. Giulotto; F. RossellaRossellaRAMAN SPECTROSCOPY, PHOTO and THERMO LUMINESCENCE, PHOTO and THERMO CONDUCTIVITY

C.B. Azzoni; M.C. Mozzati; D. MaghiniC.B. Azzoni; M.C. Mozzati; D. Maghini

EPR & MAGNETIZATION

E.R. Mognaschi E.R. Mognaschi

DIELECTRIC SPECTROSCOPYDIELECTRIC SPECTROSCOPY

OXIDES… •Para/ferroelectrics

•High-k materials

•for sensors applications

PEROVSKITE OXIDESPEROVSKITE OXIDESMain Activities Main Activities

•Phase transitions in mixed oxides based on ABO3 (KTO, STO, BTO, etc) compounds

•Structural, electronic and optical properties of intrinsic and impurities defects in ABO3

•Study of the transport phenomena and charge localization due to optical irradiation in ABO3 compounds

Study of self-ordering and of new phase transitions in soft matrices containing interacting degrees of freedom of impurities and Jahn-Teller polaronsDoped 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 STOPhoto-polarons in quantum paraelectric perovskite oxides: optical, charge transport, giant dielectric effects, structural transformations and other manifestations

Market Applications of Switchable Materials, through 2006

($ Millions)

MARKET FOR SWITCHABLE MATERIALSBUSINESS 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)

http://www.bccresearch.com/editors/RGB-267.html

Experimental facilitiesExperimental 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 *

Spectra Physics system composed by a pump laser Millennia, Ti:sapphire oscillators Tsunami emitting 70/130 fs and 1-15 ps

pulses @ 780-820 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 SpectroscopyElectronics Department - University of PaviaV. Degiorgio, I. Cristiani, D. Grando, P. Minzioni…

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 SrTiO3

F. Rossella

17:05 – 17:25 Femtosecond laser writing of surface microstructures in LiNbO3

D. Grando

17:25 – 17:50 Photorefractivity reduction in Hf-doped LiNbO3 – V. Degiorgio

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 KTa1-xNbxO3: 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

Prof. KAPPHAN,

Dr. A. GUBAEV

UOS.DE

Prof. LEVANJUK,

UAM.ES

Dr. SUCHANEK

DRESDEN.DE Dr. DEJNEKA

ASCR Prague

Dr. HUBICKA

ASCR Prague

Prof. TREPAKOV

IOFFE.RUASCR Prague

UOS.DE

Prof. Paolo Camagni(1929 – 2000)