| The spontaneous Fermi surface symmetry breaking, the so-called Pomeranchuk instability, is a fundamentally new concept in the physics of correlated electron systems. Recent neutron scattering experiments by Keimer's group showed that the Pomeranchuk instability can be a novel order competing with superconductivity in cuprates. I will give a general theory for the competition of Pomeranchuk instability and superconductivity, and discuss its relevance to cuprate superconductors. I will also emphasize that the Pomeranchuk instability itself can be a general tendency in correlated electron systems and thus can be hidden in many other materials. |
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