Dimensionality of collective pinning in 2H-NbSe{sub 2} single crystals
- Departamento de Ciencia y Tecnologia de Materiales y Fluidos, Centro Politecnico Superior, Maria de Luna, 3, E-50015 Zaragoza (Spain)
- Kamerlingh Onnes Laboratory, P.O. Box 9506, 2300 RA Leiden (The Netherlands)
- Dipartimento di Fisica, Universita di Salerno-INFM, Via S. Allende, Baronissi (SALERNO), I-84081 (Italy)
ac susceptibility measurements have been used to determine the dimensionality of the collective pinning in 2H-NbSe{sub 2} crystals. We have analyzed the thickness dependence of the critical current versus field [J{sub c}(H)] curves for thicknesses between 6 and 166 {mu}m. Down to 15 {mu}m J{sub c}(H) is independent of the thickness showing that the pinning is three dimensional. This is in agreement with estimates from collective pinning theory. Deviations occur for the 6 {mu}m thick sample near the peak-effect regime, possibly indicating a crossover to two-dimensional behavior. In the thicker samples the peak effect clearly cannot be assigned to a dimensional crossover. The frequency dependence reflects a crossover from a Campbell regime to a nonlinear regime related to small flux creep effects. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 528108
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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