Lock-in to commensurate states induced by a periodic array of nanoscale anti-dots in Nb superconductor

Details Lock-in to commensurate states induced by a periodic array of nanoscale anti-dots in Nb superconductor Lock-in to commensurate states induced by a periodic array of nanoscale anti-dots in Nb superconductor

2002-07-25

arxiv.org/abs/cond-mat/0207621v1

Physics

Condensed Matter

Superconductivity

7 pages, 4 figures

Scientific paper

10.1063/1.1627478

We study the interactions of the vortex lattice with a periodic square array of holes in a superconducting Nb film. Using high resolution magnetic field measurements of electrical losses, extremely narrow states with a magnetic field width reaching 1% of the matching field value are found at the commensurate points. They are accompanied by pronounced harmonic generation in response to ac modulation of the magnetic field or current. We relate these sharp anomalies to a locked commensurate state of the Mott insulator type.

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