Instabilities near the onset of spin density wave order in metals

Details Instabilities near the onset of spin density wave order in metals Instabilities near the onset of spin density wave order in metals

2010-07-12

arxiv.org/abs/1007.1968v3

New J.Phys.12:105007,2010

Physics

Condensed Matter

Superconductivity

14 pages, 9 figures; contribution to the special issue of the New Journal of Physics on "Fermiology of Cuprates", edited by Mi

Scientific paper

10.1088/1367-2630/12/10/105007

We discuss the low energy theory of two-dimensional metals near the onset of spin density wave order. It is well known that such a metal has a superconducting instability induced by the formation of spin-singlet pairs of electrons, with the pairing amplitude changing sign between regions of the Fermi surface connected by the spin density wave ordering wavevector. Here we review recent arguments that there is an additional instability which is nearly as strong: towards the onset of a modulated bond order which is locally an Ising-nematic order. This new instability is a consequence of an emergent "pseudospin" symmetry of the low energy theory---the symmetry maps the sign-changing pairing amplitude to the bond order parameter.

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