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Theoretical investigation of a CDDW Hamiltonian for YBa 2 Cu 3 O 7− δ
Author(s) -
Goswami Partha
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200983006
Subject(s) - brillouin zone , condensed matter physics , hamiltonian (control theory) , classification of discontinuities , position and momentum space , physics , nernst effect , jump , magnetic field , nernst equation , chemistry , quantum mechanics , mathematics , mathematical analysis , mathematical optimization , electrode
We investigate a chiral d‐density wave (CDDW) mean field Hamiltonian in momentum space for the under‐doped YBa 2 Cu 3 O 7−δ (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.