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Archives - Séminaires 2014

Investigations of Sb-containing chalcogenides by Sb NQR method

14/01/2014, Anna Orlova (LNCMI Toulouse) Investigations of antimony-containing chalcogenides Ag5SbS4 and CuPbSbS3 by Sb NQR spectroscopy Anna Orlova (1,2), R.Gainov (1), A.Dooglav (1) 1 Kazan Federal University, Kazan, Russia 2 Laboratoire National des Champs Magnétiques Intenses, Toulouse, France Download abstract in pdf

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Experimental study of the dynamics of magnetohydrodynamic (MHD) turbulence

21/01/2014, Nathaniel Baker (Coventry University& CRETA-LNCMI) Turbulent flows feature radically different dynamics whether they are two-dimensional or three-dimensional : 3D turbulence features a direct energy cascade from large scales to smaller ones, whereas 2D turbulence features an inverse energy cascade from small scales to larger ones. Both types of turbulence are becoming more and more understood (...)

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Cool properties of frustrated magnets : enhanced magnetocaloric effect

18/02/2014, Mike ZHITOMIRSKY (INAC, CEA-Grenoble) The magnetocaloric effect (MCE) refers to temperature variations of a system in response to a change of an external magnetic field. The MCE is especially strong in geometrically frustrated magnets, which exhibit a residual ground state degeneracy. I briefly survey the theoretical background and a few recent experimental studies of the MCE. Monte Carlo simulations of an (...)

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Charge tuning of Nonresonant Magnetoexciton Phonon Interactions in Graphene

11/03/2014, Bennett B. Goldberg (Boston University Masachussetts, USA) Far from resonance, the coupling of the G-band phonon to magnetoexcitons in single layer graphene displays kinks and splittings versus filling factor that are well described by Pauli blocking and unblocking of inter- and intra-Landau level transitions. We explore the nonresonant electron-phonon coupling by high-magnetic field Raman scattering while (...)

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NMR in Chemical Engineering : Pro2NMR

17/06/2014, Gisela Guthausen (Pro2NMR at IBG and IMVM, KIT, Karlsruhe, Allemagne) NMR in Chemical Engineering : Pro2NMR In chemical engineering, question arise which can be answered by magnetic resonance methods, comprising diffusion measurements, tomography and spectros­copy. Often, “real” products and processes are in the focus of interest, which limit the application of various sample preparation (...)

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Nanomagnetism of iron oxide nanoparticles into biological matrices

25/11/2014, Francisco Teran (IMDEA Nanociencia and Unidad Asociada de Nanobiotecnología, CNB-CSIC, Madrid, Spain) Nanomagnetism of iron oxide nanoparticles into biological matrices. IMDEA Nanociencia, 28049 Madrid, Spain and Unidad Asociada de Nanobiotecnología, CNB-CSIC+iMDEA Nanociencia 28049 Madrid, Spain Iron oxide nanoparticles have been rapidly incorporated into an increasing number of techniques in biology and medicine, acting as core elements (...)

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The Hofstadter butterfly in graphene

2/12/2014, Benjamin Piot (LNCMI, Grenoble) The Hofstadter butterfly in graphene In this talk, I will describe the recent experimental observation of the “Hofstadter butterfly”, a fractal energy spectrum of Bloch electrons in a magnetic field, in graphene / Boron Nitride (BN) superlattices. I will first introduce the “Hofstadter regime”, where electrons are submitted to a periodic potential and a magnetic field of comparable characteristic lengthscales, and present the concept of its (...)

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