J
J.J. Capponi
Researcher at Centre national de la recherche scientifique
Publications - 140
Citations - 4430
J.J. Capponi is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Superconductivity & Neutron diffraction. The author has an hindex of 35, co-authored 140 publications receiving 4345 citations.
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Journal ArticleDOI
Structure of the 100 K Superconductor Ba2YCu3O7 between (5 ÷ 300) K by Neutron Powder Diffraction
J.J. Capponi,C. Chaillout,A.W. Hewat,Pascal Lejay,M. Marezio,M. Marezio,N. Nguyen,B. Raveau,J L Soubeyroux,J.L. Tholence,Robert Tournier +10 more
TL;DR: In this article, the authors used profile refinement of high-resolution neutron powder data at six different temperatures between 5 K and 300 K to refine the structure of a pure and well-characterised powder sample with onset of superconductivity at 100 K.
Journal ArticleDOI
The synthesis and characterization of the HgBa2Ca2Cu3O8+δ and HgBa2Ca3Cu4O10+δ phases
Evgeny V. Antipov,Evgeny V. Antipov,Sergio Paulo Martins Loureiro,C. Chaillout,J.J. Capponi,Pierre Bordet,J.L. Tholence,S. N. Putilin,M. Marezio,M. Marezio +9 more
TL;DR: The third and fourth members of the recently discovered homologous series HgBa2Can−1CunO2n+2+δ have been synthesized by solid state reaction, carried out at 950°C under 50 kbar at different annealing times.
Journal ArticleDOI
A study of the Cu-O chains in the high Tc superconductor YBa2Cu3O7 by high resolution neutron powder diffraction
M. François,Alain Junod,Klaus Yvon,A.W. Hewat,J.J. Capponi,P. Strobel,M. Marezio,Peter M. Fischer +7 more
TL;DR: In this paper, the structure of orthorhombic YBa2Cu3O7 was refined in the temperature interval 5-320K, to an accuracy higher by a factor of about two compared to previous refinements.
Journal ArticleDOI
Pressure-induced enhancement of tc above 150 k in hg-1223.
TL;DR: Temperature-dependent electrical resistivity measurements under pressure on a (> 95%) pure Hg-1223 phase are reported and strongly suggests that higher critical temperatures could be obtained at atmospheric pressure.
Journal ArticleDOI
A note on the symmetry and Bi valence of the superconductor Bi2Sr2Ca1Cu2O8
Pierre Bordet,J.J. Capponi,C. Chaillout,J. Chenavas,A.W. Hewat,Elizabeth A. Hewat,Jean-Louis Hodeau,M. Marezio,M. Marezio,J.L. Tholence,D. Tranqui +10 more
TL;DR: In this paper, a non-centric orthorhombic A2aa cell was proposed to enable the oxygen in the BiO plane to move off the center of the Bi square to approach to within 2.2 A of a pair of Bi atoms.