Magnetic breakdown and quantum oscillations in electron-doped high-temperature superconductor Nd2−xCexCuO4
Jonghyoun Eun, Sudip Chakravarty
DOI 10.1103/PhysRevB.84.094506 · Physical Review B
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Abstract
Recent, more precise experiments have revealed both a slow and a fast quantum oscillation in the c-axis resistivity of nearly optimal to overdoped electron-doped high-temperature superconductor Nd2−xCexCuO4. Here, we study this problem from the perspective of Fermi surface reconstruction using an exact transfer matrix method and the Pichard-Landauer formula. In this method, neither quasiclassical approximations for magnetic breakdown nor ad hoc broadening of Landau levels is necessary to study the high-field quantum oscillations. The underlying Hamiltonian is a mean-field Hamiltonian that incorporates a twofold commensurate Fermi surface reconstruction. While the specific mean field considered is the d-density wave, similar results can also be obtained by a model of a spin density wave, as was explicitly demonstrated earlier. The results are consistent with an interplay of magnetic breakdown across small gaps in the reconstructed Fermi surface and Shubnikov–de Haas oscillations.
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