5,781 research outputs found
Paramagnonlike excitations and spin diffusion in magnetic resonance studies of copper oxide superconductors
The relaxation function theory for a doped two-dimensional Heisenberg
antiferromagnetic system in the paramagnetic state for all wave vectors through
the Brillouin zone is presented in view of low frequency response of high-
copper oxide superconductors. We deduced the regions of long lifetime [ K] and "overdamped" [ K]
paramagnonlike excitations in the temperature ()-doping index () phase
diagram from plane oxygen nuclear spin-lattice relaxation rate
data in up to optimally doped LaSrCuO thus providing the
regimes for the spin wave concept and the ''overdamped'' mode.Comment: Physical Review B, accepted, in pres
Exploring QCD dynamics in medium energy semiexclusive collisions
We demonstrate that studies of the semiexclusive large angle photon - nucleus
reactions: with tagged photon beams of
energies GeV which can be performed in Hall D at Thomas Jefferson
National Acceleration Facility (TJNAF) would allow to probe several aspects of
the QCD dynamics: establish the -range in which transition from soft to hard
dynamics occurs, compare the strength of the interaction of various mesons and
baryons with nucleons at the energies of few GeV, as well as look for the color
transparency effects.Comment: 13 pages, 6 figures, minor revisions, version accepted in Phys. Lett.
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