Interstitial flux phases in a superconducting niobium film with a square lattice of artificial pinning centers

V. Metlushko; U. Welp; G. W. Crabtree; R. Osgood; S. D. Bader; L. E. DeLong; Zhao Zhang; S. R. J. Brueck; B. Ilic; K. Chung; P. J. Hesketh

doi:10.1103/PhysRevB.60.R12585

Interstitial flux phases in a superconducting niobium film with a square lattice of artificial pinning centers

V. Metlushko, U. Welp, G. W. Crabtree, R. Osgood, S. D. Bader, L. E. DeLong, Zhao Zhang, S. R. J. Brueck, B. Ilic, K. Chung, P. J. Hesketh

DOI 10.1103/PhysRevB.60.R12585 · Physical Review B

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Abstract

We demonstrate that a square lattice of artificial pinning centers in a superconducting Nb film induces the formation of highly ordered interstitial vortex phases with different symmetries for external magnetic fields as high as the eighth matching field. These “supermatching” phases are identified by distinct differences in the behavior of their critical currents, magnetoresistivity, and magnetization. Our results are consistent with predictions of supermatching lattice symmetries by recent numerical simulations.

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.	6.7	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.7	Pressure not reported	unknown
W0.67Ge0.33 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown