Effect of next-nearest neighbor hopping on the spin dynamics in antiferromagnets

Abstract

Recently, inelastic neutron scattering (INS) experiments on the insulating parent compounds of high-T_c materials were analyzed to extract the value of the superexchange constant $J$. Starting point of the analysis was the nearest-neighbor Heisenberg model. Motivated by recent ARPES experiments, we consider the effects of a next-nearest neighbor hopping, $t^{\prime }$ in the strong coupling limit of the spin-density wave formalism, where it leads to an antiferromagnetic exchange $J^{\prime }>0$ between next-nearest neighbor spins. We show that a finite $J^{\prime }$ (a) changes the spin-wave velocity and thus the value of $J$ extracted from the INS data, yielding almost identical values for $J$ in La_2CuO_4 and YBa_2Cu_3O_{6.15}, and (b) leads to a considerable change in the high-frequency spin-dynamics. Finally, we calculate the 1/S quantum corrections in the presence of $J^{\prime }$ and discuss their relevance for the INS data.

4 pages, RevTeX, 3 eps figures embedded in the text; Fig.1 replaced by correct version

References in corpus (3)

• Nearly Antiferromagnetic Fermi Liquids: A Progress Report
• Superexchange coupling and spin susceptibility spectral weight in undoped monolayer cuprates
• Comment on: ``Using Ni Substitution and ${}^{17}$O NMR to Probe the Susceptibility ${\chi }^{\prime }(q)$ in Cuprates''

Cited by in corpus (3)

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