Project Details
Projekt
FOR 538: Doping Dependence of Phase Transitions and Ordering Phenomena in Cuprate Superconductors
Subject Area
Physics
Term
from 2004 to 2010
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 5470877
Doping dependence of phase transitions and ordering phenomena in copper-oxygen superconductors is the subject of this Research Unit. The purpose is to arrive at a detailed understanding of the phase diagramme of copper-oxygen systems with superconducting transition temparatures Tc up to 160 K and to disentangle general and sample related properties. As an example, while the electronic structure is essentially the same in all material classes there is a difference by an order of magnitude in the maximal Tc.
The Research Unit includes a theory project, sample preparation and five spectroscopic methods, i.e. angle-resolved photoemission (ARPES), neutron and Raman scattering, optical conductivity and electron tunneling. The combination of single and two-particle methods facilitates a better understanding of the relevant interactions in highly correlated systems. One of the main innovations of the work is the use of a common basis of samples for all spectroscopic methods and the simultaneous analysis of the results.
The questions to be addressed include:
-- properties of electron- and hole-doped cuprates as a function of carrier concentration
-- separation of generic and sample-specific properties
-- study of the various phase and metal-insulator transitions
-- charge and spin ordering
-- competition between different types of order such as charge order and superconductivity
-- quantum phase transitions at T = 0 and critical phenomena
-- study of the interactions relevant for superconductivity
The substantial improvement of the sample quality and the innovations in the experimental and theoretical techniques over the last five years allow qualitatively new insights and a much more detailed understanding of the relevant physics. This development is presently revolutionalising the view of the cuprates. The groups participating in the joint activities of the Research Unit plan to contribute substantially to this development.
The Research Unit includes a theory project, sample preparation and five spectroscopic methods, i.e. angle-resolved photoemission (ARPES), neutron and Raman scattering, optical conductivity and electron tunneling. The combination of single and two-particle methods facilitates a better understanding of the relevant interactions in highly correlated systems. One of the main innovations of the work is the use of a common basis of samples for all spectroscopic methods and the simultaneous analysis of the results.
The questions to be addressed include:
-- properties of electron- and hole-doped cuprates as a function of carrier concentration
-- separation of generic and sample-specific properties
-- study of the various phase and metal-insulator transitions
-- charge and spin ordering
-- competition between different types of order such as charge order and superconductivity
-- quantum phase transitions at T = 0 and critical phenomena
-- study of the interactions relevant for superconductivity
The substantial improvement of the sample quality and the innovations in the experimental and theoretical techniques over the last five years allow qualitatively new insights and a much more detailed understanding of the relevant physics. This development is presently revolutionalising the view of the cuprates. The groups participating in the joint activities of the Research Unit plan to contribute substantially to this development.
DFG Programme
Research Units
International Connection
Austria, Switzerland
Projects
- ARPES Study of Low Energy Electron Dynamics in Cuprate Superconductors (Applicant Knupfer, Martin )
- Crystal growth of superconducting Cuprates (Applicant Erb, Andreas )
- Infrared ellipsometry studies of cuprate high Tc superconductors (Applicant Bernhard, Christian )
- Low Energy Charge and Spin Excitations probed by NMR and Transport (Applicant Büchner, Bernd )
- Neutron scattering from cuprate superconductors (Applicant Keimer, Bernhard )
- Phenomenology of high-temperature superconducting cuprates: microscopic approach from weak coupling (Applicant Honerkamp, Carsten )
- Raman study of competing ordering phenomena in the cuprates (Applicant Hackl, Rudolf )
- Symmetrie des Ordnungsparameters und Pseudolückenverhalten in elektrondotierten Hochtemperatur-Supraleitern (Applicant Alff, Lambert )
- Theoretical investigation of the phase diagram of high-Tc superconductors (Applicant Hanke, Werner )
- Unconventional Ordering Phenomena in Cuprates (Applicant Vojta, Matthias )
- Zentralprojekt (Applicant Hackl, Rudolf )
Spokesperson
Professor Dr. Rudolf Hackl
