Abstract
We study the large xy anisotropy of magnetic excitations observed for YBa2Cu3Oy with y=6.45, 6.6, and 6.85. We show that the delicate interplay among the Pomeranchuk instability, superconductivity, and a lattice anisotropy plays an integral role to understand the observed anisotropy of magnetic excitations. The Pomeranchuk instability can be a key ingredient as an order competing with superconductivity in cuprates.
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