36 research outputs found
A Study of the S=1/2 Alternating Chain using Multiprecision Methods
In this paper we present results for the ground state and low-lying
excitations of the alternating Heisenberg antiferromagnetic chain. Our
more conventional techniques include perturbation theory about the dimer limit
and numerical diagonalization of systems of up to 28 spins. A novel application
of multiple precision numerical diagonalization allows us to determine
analytical perturbation series to high order; the results found using this
approach include ninth-order perturbation series for the ground state energy
and one magnon gap, which were previously known only to third order. We also
give the fifth-order dispersion relation and third-order exclusive neutron
scattering structure factor for one-magnon modes and numerical and analytical
binding energies of S=0 and S=1 two-magnon bound states.Comment: 16 pages, 9 figures. for submission to Phys.Rev.B. PICT files of figs
available at http://csep2.phy.ornl.gov/theory_group/people/barnes/barnes.htm
A certified plasmid reference material for the standardisation of BCR-ABL1 mRNA quantification by real-time quantitative PCR
Serial quantification of BCR–ABL1 mRNA is an important therapeutic indicator in chronic myeloid leukaemia, but there is a
substantial variation in results reported by diff
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Specific Heat of La{sub 1.875-x}Nd{sub x}Sr{sub 0.125}CuO{sub 4}: Magnetic and Structural Transitions
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Quenching and Annealing Effects on the specific Heat of YBa{sub 2}Cu{sub 3}O{sub 7-delta}
Limbic reactivity to partner reputation and rejection in social phobia: fMRl of the trust game
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