Theoretical investigation of a CDDW Hamiltonian for YBa₂Cu₃O_7−δ

Abstract

(YBCO). We consider the commensurate density wave order which doubles the unit cell of the real space lattice and show that the transition to CDDW state gives rise to the occurrence of jump discontinuities in the entropy density difference between the CDDW state and the normal metallic state at eight points (''Hot spots'') on the boundary of the reduced Brillouin zone. The chirality induced anomalous Nernst signal is shown to arise mainly from the points, close to these ''Hot spots,'' and located on the boundary of the hole pockets as reported by the previous workers. Finally, we discuss the possibility of quantum oscillations in the specific heat for the system under consideration in the presence of a changing magnetic field.