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Concept

Impurity

Publications associées (29)

Intermediate temperature embrittlement of copper alloys

Andreas Mortensen, Vincent Laporte

Copper and its alloys generally display a severe reduction in ductility between roughly 300 and 600 degrees C, a phenomenon variously called 'intermediate temperature embrittlement' or 'ductility trough behaviour'. This review of the phenomenon begins by p ...

2009

Magnetism of individual atoms adsorbed on surfaces

Harald Brune, Pietro Gambardella

Magnetic impurities in solids cause manifold changes in their macroscopic properties, such as anomalous low temperature resistance due to Kondo screening, reduction of the superconducting transition temperature due to local suppression of the order paramet ...

Elsevier2009

Low temperature hydrothermal routes to various PZT stoichiometries

Scott Harada

The production of lead zirconate titanate (PZT) with a variation in Zr and Ti ratios using a hydrothermal method has been attempted. We show that when reactions are conducted at 160 degrees C, for 4 h, the phase of PZT produced is independent of the initia ...

Springer Verlag2008

Rational Tuning of Melting Entropies for Designing Luminescent Lanthanide-Containing Thermotropic Liquid Crystals at Room Temperature

Jean-Claude Bünzli, Frédéric Gumy, Annina Aebischer

The connection of twelve peripheral and divergent dodecyloxy chains to a central tridentate aromatic binding unit provides the dodecacatenar ligand L11, for which room- temperature mesomorphism is detected. An enthalpically unbalanced large melting entropy ...

2007

The ultrafast structural response of solid parahydrogen: a complementary experimental/simulation investigation

Majed Chergui, Frank van Mourik, Luigi Bonacina

A complete characterization, based on fs pump-probe spectroscopy and mol. dynamics simulations, is presented of the ultrafast dynamics of electronic bubble formation in solid para-H2 upon impulsive excitation of impurity-doped sites, which correlate with t ...

2006

Doping quantum dimer models on the square lattice

Frédéric Mila

A family of models is proposed to describe the motion of holes in a fluctuating quantum dimer background on the square lattice. Following Castelnovo et al. [Ann. Phys. (N.Y.) 318, 316 (2005)], a generalized Rokhsar-Kivelson Hamiltonian at finite doping whi ...

2006

Magnetism and superconductivity of strongly correlated electrons on the triangular lattice

Frédéric Mila, Cédric Weber

We investigate the phase diagram of the t−J model on a triangular lattice using a variational Monte Carlo approach. We use an extended set of Gutzwiller projected fermionic trial wave functions allowing for simultaneous magnetic and superconducting order p ...

2006

Doping-induced charge trapping in organic light-emitting devices

Frank Nüesch, Libero Zuppiroli, Detlef Berner, Michel Schär

By using pyran-containing donor-acceptor dyes as doping molecules in organic light-emitting devices (OLEDs), we scrutinize the effects of charge trapping and polarization induced by the guest molecules in the electro-active host material. Laser dyes 4-(dic ...

Wiley-VCH2005

Fluid and glassy phases of vibrated granular matter studied with a torsion oscillator

Patrick Mayor

Granular matter submitted to external perturbations exhibits various behaviors depending on the vibration intensity: when strongly vibrated, the granular system has a fluid aspect, whereas under low intensity perturbations, it is in a quasi-solid phase. In ...

EPFL2005