Competing order and the asymmetric tunneling spectrum in high temperature cuprate superconductors

Jiang-Ping Hu; Kangjun Seo

doi:10.1103/PhysRevB.73.094523

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Competing order and the asymmetric tunneling spectrum in high temperature cuprate superconductors

Jiang-Ping Hu, Kangjun Seo

DOI 10.1103/PhysRevB.73.094523 · Physical Review B

T1

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Abstract

We show that the asymmetric tunneling spectrum observed in the cuprate superconductors stems from the existence of a competing order. The competition between the competing order and superconductivity can create a charge depletion region near the surface. The asymmetric response of the depletion region as the function of the external voltage causes the asymmetric tunneling spectrum. The effect is very general in a system which is near the phase boundary of two competing states favoring different carrier densities. The asymmetry which has recently been observed in the point-contact spectroscopy of the heavy fermion superconductor CeCoIn5 is another example of this effect.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown