Origin of the matching effect in a superconducting film with a hole array

U. Patel; Z. L. Xiao; J. Hua; T. Xu; D. Rosenmann; V. Novosad; J. Pearson; U. Welp; W. K. Kwok; G. W. Crabtree

doi:10.1103/PhysRevB.76.020508

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Origin of the matching effect in a superconducting film with a hole array

U. Patel, Z. L. Xiao, J. Hua, T. Xu, D. Rosenmann, V. Novosad, J. Pearson, U. Welp, W. K. Kwok, G. W. Crabtree

DOI 10.1103/PhysRevB.76.020508 · Physical Review B

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Abstract

We investigate the origin of the matching effect observed in superconducting Nb films containing regular arrays of holes near the zero-field critical temperature. We find “dips” in the resistance vs magnetic field curves at matching fields where the magnitude of the magnetic flux threading each unit cell is an integer number of the flux quantum. By comparing the magnetic field dependences of the resistance and critical temperature in perpendicular and parallel magnetic field directions, we find that the matching effect in Nb films containing triangular hole arrays originates from hole-induced suppression of the critical temperature rather than the widely assumed flux pinning enhancement.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.13	Pressure not reported	midpoint
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.354	Pressure not reported	midpoint
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.31	Pressure not reported	midpoint