Comment on “c-axis Josephson tunneling in dx2−y2-wave superconductors”

G. B. Arnold; R. A. Klemm; W. Körner; K. Scharnberg

doi:10.1103/PhysRevB.68.226501

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Comment on “c-axis Josephson tunneling in dx2−y2-wave superconductors”

G. B. Arnold, R. A. Klemm, W. Körner, K. Scharnberg

DOI 10.1103/PhysRevB.68.226501 · Physical Review B

T1

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Abstract

Without giving or citing a derivation, Maki and Haas [Phys. Rev. B 67, 020510 (2003)] presented a formula for coherent tunneling between identical dx2−y2-wave superconductors twisted about the c axis, which they claimed accounted for Andreev reflections at the grain boundary. However, their formula does not reduce to known results in the appropriate limits, casting serious doubt upon its validity, and upon its applicability to the cross-whisker data on Bi2Sr2CaCu2O8+δ by Takano et al. [Phys. Rev. B 65, 140513 (2002)] they tried to fit.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown