Theory of point-contact spectroscopy in electron-doped cuprate superconductors
C. S. Liu, W. C. Wu
DOI 10.1103/PhysRevB.76.220504 · Physical Review B
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Abstract
In the hole-doped dx2−y2-wave cuprate superconductors, due to the midgap surface state (MSS), a zero-bias conductance peak (ZBCP) is widely observed in [110] interface point-contact spectroscopy (PCS). However, a ZBCP of this geometry is rarely observed in the electron-doped cuprates, even though their pairing symmetry is still likely of the dx2−y2 wave type. We argue that this is due to the coexistence of antiferromagnetic (AF) and superconducting orders. Generalizing the Blonder-Tinkham-Klapwijk formula to include an AF coupling, it is shown explicitly that the MSS is destroyed by the AF order. The calculated PCS is in good agreement with the experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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