LLB Sientific Report 2001-2002

Director's Report

Structures and phase transitions

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• Observation of the Dynamical Structure arising from Spatially Extended Quantum Entanglement and Long-Lived Quantum Coherence in the KHCO3 crystal
• Anomalous Pressure Dependence of Acoustic Phonons of AgGaSe2 Investigated by Inelastic Neutron Scattering to 4.3GPa
• One-dimensional Stress-Strain Experiment inside an Aperiodic Inclusion Single Crystal
• Neutron Diffraction Experiments on the modulated structure of SrxBa1-xNb2O6
• Relationship between chemical composition and magnetic order in the Ce-Ni-Ge system
• Fluoroterbates: crystal structures and magnetic properties
• A new interpretation of the CO state in half-doped manganites: the ordering of Zener polarons
• Pressure Induced Crystallization of a Spin Liquid

Magnetism and superconductivity

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• Magnetic resonant mode in the single-layer high temperature superconductor Tl2Ba2CuO6+d
• Complex 2D Magnetic Correlations in Manganites studied by SANS
• Magnetic spectral response in the Kondo insulator YbB12
• Partial order in an itinerant electron magnet
• Using hot neutrons to spot small sources of magnetic anisotropy
• Photoinduced molecular switching studied by polarised neutron diffraction
• Creation and observation of polarisation domains: A new tool in SANS
• Polarised neutron reflectometry for GMR sensors optimization
• Spin-wave in layers and heterostructures
• Polarized grazing incidence diffraction as an option on EROS for the study of thin magnetic films

Materials science

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• Elastoplastic model applied to the evaluation of residual stresses in metal matrix composites
• Residual strains and crystallographic textures in natural quartzites : towards an understanding of the thermomechanical history of rocks
• Heterogeneity of residual strains in plastically deformed zirconium alloys
• Irradiation-induced hardening of martensitic steels candidates for future generation nuclear reactors

Liquid and disordered systems

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• Elementary excitations of liquid 4He in confinement
• Structural relaxation in supercooled Selenium
• Phase separation of a binary liquid system in controlled-pore glass
• Structural changes in sulphur-rich binary glasses
• Local structure and glass transition of polybutadiene up to 4Gpa

Soft matter and biomaterials

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• Self-assembly of peptide-based diblock rodcoil copolymers : from micelles and vesicles to nanocapsules
• Synthesis of insulated molecular wire: Conformation of a polyrotaxane (semi-conducting-polymers complexed inside sheaths of cyclodextrins) : Determination of the mass and the number of cyclodextrins per dimer
• Micelles counterions complexation by macrocyclic ligands
• Extrusion of vesicles through calibrated pores
• Water profile determination in a running PEMFC by small-angle neutron scattering
• Plectonemic structure of topologically constrained, supercoiled DNA
• Ionic strength dependence of the persistence length of a natural model semirigid polyelectrolyte : agreement with the OSF model

Life sciences

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• First stage of growth of lignin films on a solid surface
• Refolding of a high molecular weight protein : salt effect on collapse
• Measurement of the isothermal compressibility of hydrated myoglobin by small-angle neutron scattering
• In-vitro and in-vivo Diffusion of proteins in crowded solutions
• Influence of hydration and cation binding on parvalbumin dynamics
• Radiolysis of DNA and proteins by heavy particles generated by the nuclear reaction 10B(n, a)7Li. A study at the molecular level of boron neutron capture enhancement of fast neutron radiotherapy

Modelling

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• A nonadiabatic theory for ultrafast catalytic transfer of electrons at low temperature
• Interpretation of complex SANS spectra : contribution of numerical simulations
• Molecular dynamics simulation and neutron scattering from proteins
• A new tool for the simulation of reflectivity measurements
• Crystallographic imaging using maximum entropy
• Simbo and Enermag: two computing programs for analysing the topology of exchange interactions and the classical magnetic energy

Technical and instrumental developments

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• Fresnel Zone Plates for imaging and focusing neutrons
• Cap 2010

Experimental Programme and User Activities

Publications