Spin Stiffness in the Hubbard model

Details Spin Stiffness in the Hubbard model Spin Stiffness in the Hubbard model

1995-10-25

arxiv.org/abs/cond-mat/9510144v1

J. Phys. A 29 (1996) 41

Physics

Condensed Matter

21 Pages LaTeX2e, to be published in Journal of Physics A

Scientific paper

10.1088/0305-4470/29/1/008

The spin stiffness $\rho_{\rm s}$ of the repulsive Hubbard model that occurs in the hydrodynamic theory of antiferromagnetic spin waves is shown to be the same as the thermodynamically defined stiffness involved in twisting the order parameter. New expressions for $\rho_{\rm s}$ are derived, which enable easier interpretation, and connections with superconducting weight and gauge invariance are discussed.

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