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Stable and metastable vortex states and the first-order transition across the peak-effect region in weakly pinned<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mi>H</mml:mi><mml:mo>โ</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NbSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
The peak effect in weakly pinned superconductors is accompanied by metastable vortex states. Each metastable vortex configuration is characterized by a different critical current density ${J}_{c},$ which mainly depends on the past thermomagnetic history of the superconductor. A recent model [G. Ravikumar et al., Phys. Rev. B $61,$ R6479 (2000)] โฆ