investigation of a cddw hamiltonian to explore possibility of magneto-quantum oscillations in electronic specific heat of hole-doped cuprates

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2010
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Abstract
We investigate a chiral d-density wave (CDDW) mean field model Hamiltonian in the momentum space suitable for the hole-doped cuprates, such as YBCO, in the pseudogap phase to obtain the Fermi surface (FS) topologies, including the anisotropy parameter(ฬ๐œ€) and the elastic scattering by disorder potential (|๐‘ฃ0|). For ฬ๐œ€=0, with the chemical potential ๐œ‡=โˆ’0.27 eV for 10% doping level and |๐‘ฃ0|โ‰ฅ|๐‘ก| (where |๐‘ก|=0.25 eV is the first neighbor hopping), at zero/non-zero magnetic field (๐ต), the FS on the first Brillouin zone is found to correspond to electron pockets around antinodal regions and barely visible patches around nodal regions. For ฬ๐œ€โ‰ 0, we find Pomeranchuk distortion of FS. We next relate our findings regarding FS to the magneto-quantum oscillations in the electronic specific heat. Since the nodal quasiparticle energy values for ๐ต=0 are found to be greater than ๐œ‡ for |๐‘ฃ0|โ‰ฅ|๐‘ก|, the origin of the oscillations for nonzero ๐ต corresponds to the Fermi pockets around antinodal regions. The oscillations are shown to take place in the weak disorder regime (|๐‘ฃ0|=0.25eV) only.
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Authors ;Partha Goswami;Manju Rani
Journal majallah-i ฬ’ulum-i bฤghbฤnฤซ
Year 2010
DOI
10.1155/2010/928419
URL
http://dx.doi.org/10.1155/2010/928419
Keywords
physics

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