Nonmonotonic $d_{x^2-y^2}$ superconducting gap in electron-doped Pr$_{0.89}$LaCe$_{0.11}$CuO$_4$: Evidence of coexisting antiferromagnetism and superconductivity?

Tanmoy Das; R. S. Markiewicz; A. Bansil

doi:10.1103/PhysRevB.74.020506

paper

Nonmonotonic $d_{x^{2} - y^{2}}$ superconducting gap in electron-doped Pr $_{0.89}$ LaCe $_{0.11}$ CuO $_{4}$ : Evidence of coexisting antiferromagnetism and superconductivity?

arXiv:cond-mat/0604213 · doi:10.1103/PhysRevB.74.020506

Abstract

Recent experiments on Pr $_{0.89}$ LaCe $_{0.11}$ CuO $_{4}$ observe an anisotropic spin-correlation gap and a nonmonotonic superconducting (SC) gap, which we analyze within the framework of a $t - t^{'} - t^{''} - t^{'''} - t^{i v} - U$ model with a $d_{x^{2} - y^{2}}$ pairing interaction including a third harmonic contribution. By introducing a realistic broadening of the quasiparticle spectrum to reflect small-angle scattering, our computations explain the experimental observations, especially the presence of a maximum in the leading edge gap in the vicinity of the hot-spots. Our analysis suggests that the material behaves like a {\it two-band} superconductor with the d-wave third harmonic acting as the {\it interband pairing gap}, and that the anti-ferromagnetic (AFM) and SC orders co-exist in a uniform phase.

Nonmonotonic $d_{x^{2} - y^{2}}$ superconducting gap in electron-doped Pr $_{0.89}$ LaCe $_{0.11}$ CuO $_{4}$ : Evidence of coexisting antiferromagnetism and superconductivity?

Abstract

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Nonmonotonic dx2−y2​ superconducting gap in electron-doped Pr0.89​LaCe0.11​CuO4​: Evidence of coexisting antiferromagnetism and superconductivity?

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Nonmonotonic $d_{x^{2} - y^{2}}$ superconducting gap in electron-doped Pr $_{0.89}$ LaCe $_{0.11}$ CuO $_{4}$ : Evidence of coexisting antiferromagnetism and superconductivity?