21. April 2016 - Institut Laue-Langevin (ILL)
Investigation of phonon contributions to the high-temperature superconduction in oxygen over-stoichiometric La2-xSrxCuO4+y
ILL&NBI: Phd in High-temperature superconductivity (neutron investigation and modelling of phonons)
21. April 2016 - Institut Laue-Langevin (ILL)
Investigation of phonon contributions to the high-temperature superconduction in oxygen over-stoichiometric La2-xSrxCuO4+y
ILL&NBI: Phd in High-temperature superconductivity (neutron investigation and modelling of phonons)
Employer
Institut Laue-Langevin (ILL)
Location

Grenoble, France

Description of Institution

The Institut Laue-Langevin (ILL) is an international centre for scientific research situated in Grenoble, France. It is Europe’s leading neutron science facility. We receive over 2000 visiting scientists per year to carry out world-class research in a wide variety of scientific fields.

Job description

The Niels Bohr Institute at the University of Copenhagen (Denmark) and the Institut Laue-Langevin (ILL, Grenoble, France), jointly invite applications for a three-year PhD programme focusing on the Investigation of phonon contributions to the high-temperature superconduction in oxygen over-stoichiometric La2-xSrxCuO4+y

Project description:
This PhD proposal aims at strengthening the understanding of the electronic properties of strongly correlated cuprate high-Tc superconductors (HTSC) as they provide a wealth of competing electronic degrees of freedom, resulting in ground states which are easily tuned by subtle changes in e.g. structural parameters and electron/hole-doping. It is therefore particularly important to develop models for these systems synergetically with experimental results.
We propose to study the excitation spectrum in high-Tc cuprates which are doped to optimal Tc by a different method – by intercalating highly mobile excess oxygen in La2-xSrxCuO4 in order to yield La2-xSrxCuO4+d (LSCO+O). This doping method (super-oxygenation) produces weakly pinning, optimally doped superconductors with a phase-seperated antiferromagnetic order. Before oxygenation, Tc can be varied by the Sr content, and the LSCO -> LSCO+O system thus serves as perfect platform for studying the influence, or lack thereof, of electronic-lattice couplings on superconductivity.
The large part of this PhD project work will be devoted to the use of inelastic neutron scattering as best suited technique to analyze specific phonon branches that may couple with charges or spin. At the same time we will also do analysis of the magnetic spectrum of oxygen over-stoichiometric samples to compare with the hourglass dispersion of other HTSC cuprates, another aspect where neutrons are the leading probe.

Job description: The successful PhD student will:

  • Be fully involved in all stages of the project and will be encouraged to independently push forward the research topic following new ideas under the supervision of proposers.
  • Be in charge of the preparation and characterization of super-oxygenated samples by electrochemical methods.
  • Be responsible for preparation and execution of research proposals to perform neutron or x-ray experiments following the results of precedent measurements.
  • Perform density functional theory and molecular dynamics calculations in selected supercell structures of LSCO+O with interstitial oxygen. Due to the fact that LDA/DFT measurement up to now failed in depicting the strength of electron-phonon, we propose the student will develop a simplified model of local correlation in the CuO2 planes.
  • Have access to our large international collaboration network to perform experiments with experts on complementary techniques such as e.g. ARPES.
  • Take PhD courses
  • Write scientific articles and the PhD thesis
  • Participate in conferences
  • Teach and disseminate your research

The successful candidate will be employed for a period of up to three years. The PhD project will be located for 2/3 of the time in Grenoble (France) at the ILL 1/3 in Copenhagen at the NBI (Denmark).

Principal supervisor:
Associate professor Linda Udby, Niels Bohr Institute, , +45 23829877. Co-supervisors are Andrea Piovano, )ill.fr, and Martin Boehm, )ill.fr , Institut Laue-Langevin, Grenoble France.

Requested Profile

Key criteria for the assessment of candidates:

  • A master’s degree related to the subject area of the project
  • The grade point average achieved
  • Professional qualifications relevant to the PhD programme
  • Relevant work experience with neutron scattering and physics education research
  • English spoken and written fluently

Contact
» print (allow pop-up windows)

Copyright 2012 neutronsources.org   |   All rights reserved.   |   Powered by FRM II | Privacy Policy

Print this page   |   Top