Nonmonotonic dx2−y2 superconducting gap in electron-doped Pr0.89LaCe0.11CuO4: Evidence of coexisting antiferromagnetism and superconductivity?
Tanmoy Das, R. S. Markiewicz, A. Bansil
DOI 10.1103/PhysRevB.74.020506 · Physical Review B
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Abstract
Recent experiments on Pr0.89LaCe0.11CuO4 observe an anisotropic spin-correlation gap and a nonmonotonic superconducting (SC) gap, which we analyze within the framework of a t−t′−t″−t‴−tiv−U model with a dx2−y2 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 two-band superconductor with the d-wave third harmonic acting as the interband pairing gap, and that the antiferromagnetic and SC orders coexist in a uniform phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr0.89LaCe0.11CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | onset |
| Pr0.89LaCe0.11CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
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