The specific heat jump at the magnetic-field-induced metal-spin-density-wave transition in quasi-one-dimensional conductors

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Abstract
The evolution of the specific heat jump at the magnetic-field-induced metal-spin-density-wave transition in quasi-1D conductors is shown to exhibit an oscillatory behaviour with the magnetic field with a discontinuity at the transitions between two spin-density-wave subphases. Whereas the specific heat jump is smaller than the BCS value in low fields, it becomes larger than this value in high field, and then equal to it in infinite field. The results obtained are in qualitative agreement with experiments on Bechgaard salts.