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57 papers · 1 filter
Magnetic interactions and the pressure phase-diagram of CuGeO3
P. H. M. van Loosdrecht, J. Zeman, G. Martinez +3
A pressure and temperature dependent Raman study of the vibrational and spin dynamics in CuGeO3 is presented. A new low temperature, high pressure phase has been identified, and a…
Experimental constraints on the parameter space of the next-to-minimal supersymmetric standard model at LEP 2
Seung Woo Ham, Sun Kun Oh, Bjong Ro Kim
We search for the neutral Higgs sector of the next-to-minimal supersymmetric standard model at LEP 2. At the tree level any experimental constraints on cannot be set by th…
From microscopic description to statistical mechanics of Cu-O chain fragments in the high-Tc superconductors REBa_2Cu_3O_{6+x}
H. Haugerud, G. Uimin, W. Selke
The oxygen deficient CuO_x planes of the high-Tc superconductors REBa_2Cu_3O_{6+x} (RE denotes a rare-earth atom or yttrium) are studied. Starting from the Emery model for the Cu-O…
Determination of the Longitudinal Proton Structure Function F_L(x,Q^2) at Low x
C. Adloff
A measurement of the inclusive cross section for the deep-inelastic scattering of positrons off protons at HERA is presented at momentum transfers and…
Substitution effects on spin fluctuations in the spin-Peierls compound CuGeO_3
M. Fischer, P. Lemmens, G. Güntherodt +4
Using Raman scattering we studied the effect of substitutions on 1D spin fluctuations in CuGeO_3 observed as a spinon continuum in frustration induced exchange scattering. For temp…
Finite-size scaling of the helicity modulus of the two-dimensional O(3) model
Norbert Schultka
Using Monte Carlo methods, we compute the finite-size scaling function of the helicity modulus of the two-dimensional O(3) model and compare it to the low temperature expansion…