Concept

Unit cell

Publications associées (57)

A maximum likelihood approach to two-dimensional crystals

Maximum likelihood (ML) processing of transmission electron microscopy images of protein particles can produce reconstructions of superior resolution due to a reduced reference bias. We have investigated a ML processing approach to images centered on the u ...

Elsevier BV2007

Dynamics of the quantum dimer model on the triangular lattice: Soft modes and local resonating valence-bond correlations

Frédéric Mila, Dmitri Ivanov

We report on an exhaustive investigation of the dynamical dimer-dimer correlations in imaginary time for the quantum dimer model on the triangular lattice using the Green’s function Monte Carlo method. We show in particular that soft modes develop upon red ...

2006

Bond-order-modulated staggered-flux phase of thetJmodel on a square lattice

Frédéric Mila, Cédric Weber

Motivated by the observation of inhomogeneous patterns in some high-Tc cuprate compounds, several variational Gutzwiller-projected wave functions with built-in charge and bond-order parameters are proposed for the extended t−J−V model on the square lattice ...

2006

Powder crystallography by proton solid-state NMR spectroscopy

David Lyndon Emsley

The investigation of H-1-H-1 spin-diffusion build-up curves using a rate matrix analysis approach shows that high-resolution magic angle spinning NMR of protons, applied to powdered organic compounds, provides a method to probe crystalline arrangements. Th ...

AMER CHEMICAL SOC2005

Hex-Splines: A Novel Spline Family for Hexagonal Lattices

Michaël Unser, Dimitri Nestor Alice Van De Ville, Thierry Blu

This paper proposes a new family of bivariate, non-separable splines, called hex-splines, especially designed for hexagonal lattices. The starting point of the construction is the indicator function of the Voronoi cell, which is used to define in a natural ...

IEEE2004

Na3CsCo7(PO4)6: A New Magnetic Cobalt(II) Phosphate Compound Containing an Interesting Cobalt Network Structure Made of Triangular Lattices

Wendy Lee Queen

A new cobalt(II) phosphate compd. has been synthesized using high-temp. flux methods in the CsCl/NaCl media at 650°C. The title compd., Na3CsCo7(PO4)6, forms vibrant purple plate crystals. It crystallizes in a monoclinic space group C2/c (no. 15) with the ...

American Chemical Society2004

Molecular dynamics simulation of hexamine and suberic acid

Gervais Chapuis

In order to perform a molecular dynamics (MD) simulation of the incommensurate crystalline structure hexamethylenetetramine suberate (C6H12N4)(HOOC-(CH2)(6)-COOH), we present in a first step the separate simulations of the crystalline structure of each of ...

2003

Compositional Heterogeneity Reflects Partial Dehydration in Three-dimensional Crystals of Bacteriorhodopsin

Majed Chergui, Erwin Portuondo Campa, Goran Zgrablic, Stefan Haacke, Selma Schenkl

Absorption, fluorescence and excitation spectra of three-dimensional bacteriorhodopsin crystals harvested from a lipidic cubic phase are presented. The combination of the spectroscopic expts. performed at room temp., controlled pH and full external hydrati ...

2003

The (3+1)-dimensional superspace description of the commensurately modulated structure of p-chlorobenzamide (alpha-form) and its relation to the gamma-form

Gervais Chapuis, Philip Pattison

The room temperature structure (a-form) of the organic compound p-chlorobenzamide, C7H6ClNO, can be described as a classical three-dimensional periodic superstructure (alpha(s)) and also as a commensurately modulated structure (alpha(m)) in (3 + 1)-dimensi ...

2003

Structural investigation of thin SrTiO3 films grown on MgO and LaAlO3 substrates

Nava Setter, Alexander Tagantsev, Konstantin Astafiev

Structural investigations of SrTiO3 thin films deposited by pulsed laser ablation onto MgO and LaAlO3 substrates are presented. The residual strain along the c -axis (the growth direction) was evaluated with conventional X-ray diffraction. Evaluation of th ...

2003

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