Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 19, Pages 4168-4171Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.4168
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We have studied the temperature dependence of the in-plane resistivity of NbN/AlN multilayer samples with varying insulating layer thickness in magnetic fields up to 7 T parallel and perpendicular to the films. The upper critical field shows a crossover from 2D to 3D behavior in parallel fields. The irreversibility lines have the form (1 - T/T-c)(alpha), where alpha varies from 4/3 to 2 with increasing anisotropy. The results are consistent with simultaneous melting and decoupling transitions for the low anisotropy sample, and with melting of decoupled pancakes in the superconducting layers for higher anisotropy samples.
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