Andreev Bound States at the Onset of Phase Coherence in Bi2Sr2CaCu2O8

H. Aubin; L. H. Greene; Sha Jian; D. G. Hinks

doi:10.1103/PhysRevLett.89.177001

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Andreev Bound States at the Onset of Phase Coherence in Bi2Sr2CaCu2O8

H. Aubin, L. H. Greene, Sha Jian, D. G. Hinks

DOI 10.1103/PhysRevLett.89.177001 · Physical Review Letters

T1

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Abstract

A new technique of planar tunneling spectroscopy has been developed to access the in-plane density of states of optimally doped Bi2Sr2CaCu2O8 single crystals. The low energy spectrum is observed to depend on crystallographic orientation. When tunnel current is injected nominally along the Cu-Cu bond direction, a zero-bias conductance peak is observed to appear simultaneously with the onset of bulk superconductivity. These data demonstrate the existence of surface-induced states in this system and confirm the d-wave symmetry of the superconducting order parameter.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95	Pressure not reported	onset
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown