Concept

Effet Meissner

Publications associées (68)

Radiative lifetime of a single electron-hole pair in GaN/AlN quantum dots

Wurtzite GaN/AlN quantum dots (QDs) are studied by time-resolved photoluminescence. Careful measurements allow us to reach the regime of a single electron-hole pair per dot, evidenced by a monoexponential decay of the luminescence and a stop of the time-de ...

2006

Three-dimensionality of field-induced magnetism in a high-temperature superconductor

Henrik Moodysson Rønnow

Many physical properties of high-temperature superconductors are two-dimensional phenomena derived from their square-planar CuO2 building blocks. This is especially true of the magnetism from the copper ions. As mobile charge carriers enter the CuO2 layers ...

2005

Carrier relaxation time divergence in single and double layer cuprates

Davor Pavuna, Mike Abrecht

We report the transient optical pump-probe reflectivity measurements on single and double layer cuprate single crystals and thin films of ten different stoichiometries. We find that with sufficiently low fluence the relaxation time (tau(R)) of all samples ...

2003

Finite element method analysis of the coupling effect between superconducting filaments of different aspect ratio

Francesco Grilli, Yong Yang, Bertrand Dutoit

Using 3D finite element method (FEM) modelling, the present work investigates the coupling effect between two finite superconductors through a resistive matrix. This effect, related to the finite length of the conductors, is typically three-dimensional and ...

2003

Development of high temperature superconductor current leads for 70 kA

Rainer Wesche

The Forschungszentrum Karlsruhe (FZK) and the Centre de Recherches en Physique des Plasmas (CRPP) are working on a joint development program to construct and test a 70 kA current lead using High Temperature Superconductors (HTS) for the Toroidal Field (TF) ...

2002

Statics and dynamics of the magnetic soliton lattice in the high-field phase of CuGeO3

Henrik Moodysson Rønnow, Mechthild Enderle

Driven by antiferromagnetic quantum fluctuations on a deformable lattice, spin-Peierls systems dimerize magnetically and structurally at low temperatures. In this dimer phase all excitations with non-zero magnetization have a finite energy. The energy gain ...

2001

Warped compactification on Abelian vortex in six dimensions

We consider the possibility of localizing gravity on a Nielsen-Olesen vortex in the context of the Abelian Higgs model. The vortex lives in a six-dimensional space-time with negative bulk cosmological constant. In this model we find a region of the paramet ...

2001

Superfluid and normal-fluid densities in the high-T-c superconductors

Giorgio Margaritondo, László Forró, Helmuth Berger

In clean metallic superconductors, 100% of the mobile carriers participate ill the condensate, so that the London penetration depth (which measures the electromagnetic screening by the superconductor) indicates charge densities comparable to those inferred ...

2000

Optical study of an untwinned (Bi1.57Pb0.43)Sr2CaCu2O8+delta single crystal: ab-plane anisotropy

Giorgio Margaritondo, Helmuth Berger

We report on the ab-plane polarized reflectance of an untwinned (Bi1.57Pb0.43)Sr2CaCu2O8+delta single crystal over the frequency range from 80 to 32 000 cm(-1) (10 meV-4 eV) at temperatures between 10 and 300 K. We find a clear anisotropy in the ab-plane o ...

1999

ab-plane optical spectra of iodine-intercalated Bi1.9Pb0.1Sr2CaCu2O8+delta: Normal and superconducting properties

Giorgio Margaritondo, Helmuth Berger

We report on the ab-plane optical reflectance of an iodine-intercalated Bi1.9Pb0.1Sr2CaCu2O8+delta single crystal in the 80-40000 cm(-1) (10 meV-5 eV) frequency range and at temperatures between 10 and 300 K. As compared to the iodine-free Bi2Sr2CaCu2O8+de ...

1999

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