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18 papers · 1 filter
Effect of Nonmagnetic Impurities on the Magnetic Resonance Peak in YBa2Cu3O7
H. F. Fong, P. Bourges, Y. Sidis +6
The magnetic excitation spectrum of a YBa_2 Cu_3 O_7 crystal containing 0.5% of nonmagnetic (Zn) impurities has been determined by inelastic neutron scattering. Whereas in the pure…
Structural evidence for the continuity of liquid and glassy water
Francis W. Starr, Marie-Claire Bellissent-Funel, H. Eugene Stanley
An open question is whether the liquid and glassy phases of water are thermodynamically distinct or continuous. Here we address this question using molecular dynamics simulations i…
The microscopic spin-phonon coupling constants in CuGeO_3
R. Werner, C. Gros, M. Braden
Using RPA results, mean field theory, and refined data for the polarization vectors we determine the coupling constants of the four Peierls-active phonon modes to the spin chains o…
Effective action for the Kondo lattice model. New approach for S=1/2
F. Bouis, M. N. Kiselev
In the partition function of the Kondo lattice, spin matrices are exactly replaced by bilinear combinations of Fermi operators with the purely imaginary chemical potential lambda=-…
Spin Dynamics in the Magnetic Chains Arrays of Sr14Cu24O41: a Neutron Inelastic scattering Investigation
L. P. Regnault, J. P. Boucher, H. Moudden +5
Below about 150 K, the spin arrangement in the chain arrays of Sr14Cu24O41 is shown to develop in two dimensions (2D). Both the correlations and the dispersion of the observed elem…
Manifestation of classical bifurcation in the spectrum of the integrable quantum dimer
S. Aubry, S. Flach, K. Kladko +1
We analyze the classical and quantum properties of the integrable dimer problem. The classical version exhibits exactly one bifurcation in phase space, which gives birth to permuta…