| Autor: |
BANERJEE, SS, RAMAKRISHNAN, S, GROVER, AK, RAVIKUMAR, G, MISHRA, PK, SAHNI, VC, TOMY, CV, BALAKRISHNAN, G, PAUL, DM, GAMMEL, PL, BISHOP, DJ, BUCHER, E, HIGGINS, MJ, BHATTACHARYA, S |
| Jazyk: |
angličtina |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
IndraStra Global. |
| ISSN: |
2381-3652 |
| Popis: |
The magnetic field dependence of the critical current is studied in single-crystal samples of the weak pinning type-II superconductor 2H-NbSe2 in the high-temperature and the low-field region of the (H,T) space. The experimental results demonstrate various pinning regimes: a collective pinned quasiordered solid in the intermediate-field range that is destabilized in favor of disordered vortex phases in both high fields near H-c2 and at low fields near H-c1. The temperature evolution of the pinning behavior demonstrates how the amorphous limit (where the correlation volume is nearly field independent) is approached around the so-called nose region of the reentrant peak-effect boundary. In the high-field regime the rapid approach to the amorphous limit naturally yields a peak effect, i.e., a peak in the critical current. In the low-field regime the crossover to the individual pinning regime gives rise to a "plateau effect." We show that with increasing effective pinning the peak effect shifts away from H-c2 and resembles a "fishtail" anomaly. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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