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Archives - Séminaires 2013

Séminaires 2013

Le LNCMI accueille et tient une moyenne environ 25 séminaires scientifiques par an. Ici vous trouverez la liste des séminaires de 2013.

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Photo-excited carrier dynamics, collinear scattering, and carrier multiplication in grapheme

9/01/2013, Marco Poloni, NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Pisa, Italy, Graphene is emerging as a viable alternative to conventional optoelectronic, plasmonic, and nanophotonic materials. The interaction of light with graphene creates a non-equilibrium carrier distribution, which first relaxes on an ultrafast timescale to a hot Fermi-Dirac distribution and then cools via phonon emission. While (...)

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Fermi surface and superconductivity in URhGe and other nonsymmorphic crystals

10/01/2013, Ed Yeland, University of St Andrews, Scotland, URhGe orders ferromagnetically below 9.5K and coexisting superconductivity develops in the cleanest samples at 300mK. For magnetic fields applied along the b-axis, superconductivity is first destroyed at a critical field 2T but a second superconducting phase forms at higher fields 8<B<12T. I discuss the role of a small, strongly magnetic field-dependent Fermi surface (...)

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Quantum oscillations as a probe of hidden order in heavy fermion systems

15/01/2013, Alix McCollam, HFML, Radboud University, Nijmegen, The Netherlands Quantum oscillations are well known as a highly sensitive probe of electronic structure, and have a long history of providing valuable information about the Fermi surface and quasiparticle properties. In the first part of this talk, I will discuss measurements of the de Haas-van Alphen effect in PrOs4Sb12, which show that quantum oscillations (...)

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Design of functional metallo-supramolecular assemblies

Mardi 12 février à 13h30, Marie-Claire Dul (Laboratoire de Chimie et Physico-chimie des Actinides, Institut de Chimie Séparative de Marcoule, Bagnols-sur-Cèze) Introducing functionality into self-assembled compounds is one of the challenges nowadays in supramolecular chemistry in order to design new compounds with specific structure and controlled properties. The choice of metal ions is of major interest in (...)

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Polyoxométallates fonctionnalisés à propriétés optiques ou magnétiques

16/05/2013 - J.D. Compain (DCM, UJF, Grenoble) Les polyoxométallates (POMs), ou clusters d’oxydes métalliques solubles, font l’objet d’un intérêt toujours croissant aussi bien pour les architectures originales qu’ils proposent que pour leurs nombreuses propriétés physico-chimiques. A travers de nouvelles espèces synthétisées soit en conditions usuelles, soit par voie hydrothermale, cette présentation développera (...)

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Optical manipulation of polariton condensates in microcavity ridges

19/04/2013, Luis Viña, (Depto. Física de Materiales, Universidad Autónoma de Madrid, Spain) The use of polariton condensates in all optical logic devices has been the subject of intense research in recent years, promising ultrafast switching times, low losses, spin information transport and low power consumption. In this talk we shall discuss the realization of novel switches mediated by propagating Bose-Einstein exciton-polariton (...)

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Non-centrosymmetric superconductivity in d-electron compounds

30/04/2013, Gaku Eguchi (Department of Systems Innovation, Graduate School of Engineering Science, Osaka University, Japan) Superconducting state in a non-centrosymmetric crystal is understood as a spin singlet-triplet mixed state[1]. The novel superconducting state is realized due to the presence of finite antisymmetric spin-orbit interaction, which exhibits an electronic momentum-dependent effective Zeeman (...)

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Transport through suspended graphene devices

27/05/2013, Prof. Alberto Morpurgo, from the University of Geneva The experimental investigation of the intrinsic transport properties of graphene requires that all extrinsic sources of disorder affecting this material are eliminated. Disorder is caused mainly by most other materials, like the supporting substrate or adsorbates, that are in direct contact with graphene itself. Therefore, eliminating this (...)

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Magneto-optical surveys of geometrically frustrated magnets in ultra-high magnetic fields

11/06/2013, Dr. A. Miyata (Institute for solid State Physics, University of Tokyo, Japan) Geometrically frustrated magnets have attracted considerable attention, because frustrated states are very sensitive to any type of perturbations and would exhibit a rich variety of magnetic phases depending on the temperature and the magnetic field. In my talk, I will explain how to generate ultra-high magnetic fields above 100 T and its application into the magneto-optical measurements of typical 3D (...)

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Attempts to observe the entropy landscape in the pulsed magnetic fields above 50 T ; Specific heat and magnetocaloric effect measurements in the pulsed magnetic fields..

14/06/2013 (13h30), Dr. Y. Kohama (Institute For Solid State Physics, International MegaGauss Science Laboratory, University of Tokyo, Japan) The aparatus for measuring specific heat (Cp) and magnetocaloric effect (MCE) were developed for the experiments under pulsed magnetic fields. Since Cp measures the entropy as a function of temperature and MCE traces the isoentropic (H,T) curve, the combination of both techniques can be used to obtain the entropic (H,T) surface. The details of the (...)

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Status of the Hybrid Magnet in Construction at LNCMI-Grenoble

02/04/2013, Pierre Pugnat, LNCMI-Grenoble A CEA-CNRS French collaboration is currently developing a new hybrid magnet to create an overall continuous magnetic field of at least 43 T in a 34 mm warm bore aperture. This magnet combines a resistive insert, composed of Bitter and polyhelix coils, and a large bore superconducting "outsert". The superconducting coil is based on the novel development of a (...)

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Superconducting magnet testing and HTS magnet design at CERN

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Bi-cuprate high-Tc superconducting material, wire and magnets - from nm-scale to beyond km-length

25/06/2013, 14:30, Dr. H. Kitaguchi (NIMS, Japan) The development of Bi-2223 high-Tc superconductor (HTS) and its magnet applications will be reviewed after a brief overview of research activities in Superconducting Wire Unit, NIMS. Topics : - Materials science study - thin film fabrication and microstructure - Development of long length tape in km-range - Magnets – liquid nitrogen bath 1T magnet and cryocooled 3T MRI (...)

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Time Reversal Symmetry Breaking in Unconventional Superconductors

18/11/2013, Aharon Kapitulnik (Stanford University, USA) In this talk we will survey current searches for time reversal symmetry breaking (TRSB) in unconventional superconductors, concentrating on several classes of systems. Our studies utilize a modified Sagnac interferometer that can measure polar Kerr effect with resolution exceeding 10^-8 rad, which is sensitive to antisymmetric contributions to the real and imaginary parts of the frequency-dependent (...)

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Spin helical transport in normal and superconducting topological insulators.

19/11/2013 Ewelina Hankiewicz (Institut für Theoretische Physik, Université de Würzburg, Germany) Topological insulators (TIs) have a bulk energy gap that separates the highest occupied band from the lowest unoccupied band like in ordinary insulators. However, the edge (for 2D TIs) or the surface (for 3D TIs) of a topological insulator exhibits gapless electronic states that are protected by time reversal symmetry (...)

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Recent ultrasound measurements on strongly correlated electron systems under magnetic field and hydrostatic pressure in Japan and HZDR Dresden

26/11/2013, Yoshiki Nakanishi (Graduate School of Engineering, Iwate University, Japan and Dresden HMLF, HZDR, Germany) A role of electric quadrupolar degrees of freedom on the low temperature properties in the vicinity of quantum critical point (QCP) is a subject of increasing interest in recent years. Ultrasound investigation is one of the most powerful method to probe the phononic degrees of freedom including the electric (...)

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