Neutron diffusion make possible to probe the matter and its sensitivity to the light elements and to magnetism make it a single and original probe. Within DRECAM, neutron spectrometry is used in various fields in fundamental and applied research and is developed around the CEA-CNRS Laboratory Leon Brillouin (LLB) around the Orphée reactor in Saclay. Neutrons are mainly intended for the study of condensed matter. The scientific activity of the laboratory belongs to three sectors of equal importance: physicochemistry, structural studies and phase transitions, magnetism and supraconductivity.
The Orphée (LLB) and Osiris reactors of the research Center of Saclay are also neutron sources to activate samples which are then analyzed by γ spectrometry (See Instrumental Neutron Activation Analysis).
D. S. Inosov1, J. T. Park1, P. Bourges2, D. L. Sun1, Y. Sidis2, A. Schneidewind3,4, K. Hradil4,5, D.Haug1, C. T. Lin1, B. Keimer1, and V. Hinkov
1 Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany2 Laboratoire Léon Brillouin, CEA-CNRS, CEA Saclay, 91191 Gif-sur-Yvette, France3 Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM-II), TU München, D-85747 Garching, Germany In ... More »
Elmar C. Fuchs1, Brigitte Bitschnau2, Jakob Woisetschläger3, Eugen Maier4, Brigitte Beuneu5 and José Teixeira5 1Wetsus, Center of Excellence for Sustainable Water Technology, Agora 1, 8900 CC Leeuwarden, The Netherlands2Institute of Physical and Theoretical Chemistry, Graz University ... More »
(1,2) B. Toudic, P. Garcia, C. Odin, P. Rabiller, C. Ecolivet and E. Collet,
P. Bourges3, G.J. McIntyre4, M.D. Hollingsworth5, T. Breczewski6
1 Institut de Physique de Rennes, CNRS UMR 6251, Univ. Rennes 1, 35042 Rennes, France2 CNRS, UMR 6251, IPR, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France.3 Laboratoire Léon Brillouin, CEA-CNRS, CEA Saclay, 91191 Gif-sur-Yvette, France4 Institut Laue-Langevin, ... More »
S. Petit, F. Moussa, M. Hennion et S. Pailhès (DRECAM/LLB CEA-Saclay)
L. Pinsard-Godard, Laboratoire de Chimie du Solide, Paris XI
A. Ivanov, ILL, BP 156 F-38042 Grenoble
Multi-ferroïcs are exceptional materials whose fundamental state is both magnetic and ferro-electric . Moreover, in such materials, magnetism and ferroelectricity maintains close links: as for example the manganese oxide YMnO3 , can see its magnetization modified by the action of an ... More »
One liquid and amorphous diffractometer is available at the LLB :
The improvement of the mechanical properties of polymer films by inclusion of mineral particles is a well known industrial practice used since the end of the XIX century. A classical example is the rubber industry for which the addition of carbon black as fillers permits to increase the elastic ... More »
Control of roughness at interfaces and the impact on charge mobility in all-polymer field-effect transistors.
Using conjugated polymers as the active materials in electronic and optoelectronic devices opens up the possibility of fabricating all-polymer devices using solution processing technologies. The fabrication of good quality field-effect transistors (FETs) is crucial to a number of polymer-based ... More »
Light-harvesting antennae are pigment-protein complexes involved in light-absorption and excitation energy transfer (EET) to the so-called "reaction center" complexes, where the photochemical processes of photosynthesis take place. C-phycocyanin (C-PC) is one component of the phycobilisome, the ... More »
The strongly interacting conduction electrons can be accurately represented as a gas of weakly interacting electron-like excitations. This description, known as Fermi liquid theory, works for many metallic systems. However, over the past two decades, new types of metallic materials with strongly ... More »
Following the synthesis by the ribosome, to carry out its biological function, a protein much fold into a single, well defined conformational state: the native state. Protein folding is thus the physico-chemical process by which a polypeptidic chain undergoes a structural change from an ensemble of ... More »
Influence of the alteration layer morphology on the silicate glass corrosion mechanism : role of Ca and Zr
This study investigates the long term behavior of glasses used for confinement of nuclear wastes. The results have been obtained from a fruitful collaboration between different CEA laboratories (LLB, LIONS, CEA Marcoule) and the Ecole Polytechnique. The corrosion process of the glasses by water ... More »
BiFeO3 is a multiferroic materials in which ferroelectric and anti-ferromagnetic orders coexist well above room temperature (TN=643 K, TC=1093 K), with a high polarization (over 100 μC/cm2 ). We have shown at the LLB by neutron diffraction that these two order parameters interact and that the ... More »
In 1893 Sir William Armstrong reported a remarkable experiment: if a high voltage is established between two wine-glasses filled to the brim with pure water and connected by a cotton thread, a rope of water is formed and remains suspended between the lips of the two glasses. This "water ... More »
The use of agricultural resources for industrial purposes will undoubtly be one of the major challenges of the 21 st century. Organic biosynthons used in chemistry should progressively replace those coming from fossil fuels. Our work on dispersions of fatty acids and hydroxylated derivatives forms ... More »
The concept of "spin ladder" originally appeared to study the theoretically still controversial antiferromagnet (AF) 2D square lattice in high temperature superconducting cuprates starting from a well understood 1D AF chain [1-2]. They can been schematized as an array of finite number of coupled ... More »
Superconducting pairing and electronic anomalies induced by the spin collective mode in HTC superconductors.
This work is part of a theoretical project which aims to unravel the mechanism at work in the high temperature cuprate superconductors. In the recent article  we have studied the role of spin fluctuations, and namely of the collective spin mode, for the superconducting pairing and numerous ... More »
The pseudogap region of the phase diagram is an important unsolved puzzle in the field of hightransition-temperature (Tc) superconductivity, characterized by anomalous physical properties below a certain temperature, T*. In contrast to the superconducting temperature Tc which exhibits a ... More »