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We report on the observation of novel features in the minor hysteresis loopsin a clean crystal of NbSe_2 which displays a peak effect. The observedbehavior can be explained in terms of a supercooling of the disordered vortexphase while cooling the superconductor in a field. Also, the extent of spatialorder in a flux line lattice formed in ascending fields is different from (andlarger than) that in the descending fields below the peak position of the peakeffect; this is attributed to unequal degree of annealing of the state inducedby a change of field in the two cases.Comment: 5 pages of text + 6 figures, submitted to Phys. Rev.

physical review. b, condensed matter

Supercooling of the disordered vortex phase via minor hysteresis loops in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mi mathvariant="normal">H</mml:mi><mml:mo>−</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>

Supercooling of the disordered vortex phase via minor hysteresis loops in2H−NbSe2