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6 papers · 1 filter
Mobility and Reactivity of Discrete Breathers
S. Aubry, T. Cretegny
Breathers may be mobile close to an instability threshold where the frequency of a pinning mode vanishes. The translation mode is a marginal mode that is a solution of the lineariz…
Ferromagnetic Mixed-Valence and Kondo-Lattice State in TmTe at High Pressure
P. Link, I. N. Goncharenko, J. -M. Mignot +2
Neutron diffraction experiments on TmTe at pressures up to 7 GPa are reported. The semiconductor-to-metal transition occurring at 2 GPa in this compound is accompanied by the appea…
RKKY interaction in the nearly-nested Fermi liquid
D. N. Aristov, S. V. Maleyev
We present the results of analytical evaluation of the indirect RKKY interaction in a layered metal with nearly nested (almost squared) Fermi surface. The final expressions are obt…
Superexchange coupling and spin susceptibility spectral weight in undoped monolayer cuprates
P. Bourges, H. Casalta, A. S. Ivanov +1
A systematic inelastic neutron scattering study of the superexchange interaction in three different undoped monolayer cuprates (La_2CuO_4, Nd_2CuO_4 and Pr_2CuO_4) has been perform…
Shifting of the magnetic resonance peak to lower energy in the superconducting state of underdoped YBa_2Cu_3O_{6.8}
Ph. Bourges, L. P. Regnault, Y. Sidis +5
Inelastic neutron scattering has been used to determine the dynamic spin fluctuations in an underdoped high temperature superconductor YBCO_{6.8} single crystal. The magnetic reson…
High energy spin excitations in YBa_2 Cu_3 O_{6.5}
Ph. Bourges, H. F. Fong, L. P. Regnault +5
Inelastic neutron scattering has been used to obtain a comprehensive description of the absolute dynamical spin susceptibility of the underdoped superconducting cuprate…