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.
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
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:
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).
Associate professor Linda Udby, Niels Bohr Institute, udby(at)nbi.dk, +45 23829877. Co-supervisors are Andrea Piovano, piovano(at)ill.fr)ill.fr, and Martin Boehm, boehm(at)ill.fr)ill.fr , Institut Laue-Langevin, Grenoble France.
Key criteria for the assessment of candidates:
Andrea Piovano, research scientist, Institut Laue Langevin,
71 avenue des Martyrs 38000 Grenoble (France)