A novel form of Jahn-Teller (JT) effect in the cuprates can be reinterpreted as a conventional JT effect on a lattice with a larger unit cell. There is a triplet of instabilities, parametrized by a pseudospin, consisting of a form of the low-temperature tetragonal phase, a charge density wave phase, and a flux phase (orbital antiferromagnet). On a single 4-Cu plaquette, the problem is of E ⊗ (b1 + b2) form. For a special choice of parameters, the model supports a dynamic JT effect, but is classically chaotic. The connection of this phase with Berryonic matter is discussed.
JT effect, cuprates, Berryonic matter, pseudospin
Jahn-Teller effect, Condensed matter
Markiewicz, R. S., "Berryonic matter in the cuprates" (2001). Physics Faculty Publications. Paper 38. http://hdl.handle.net/2047/d20000391
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