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Unusual magnetic field-induced transition in the low temperature (T < 1 K) SDW ground state of (TMTSF)2PF6

We have observed a strong sensitivity to low magnetic field (H<0.5T) of the low-temperature specific heat of (TMTSF)2PF6 in its spin-density wave ground state. The mostly pronounced manifestation is a sharp maximum at H = 0.2 T in the amplitude of Shottky anomaly contribution which dominates the heat capacity below 0.3 K. This effect is independent of the field direction for H // a or b' crystal axis.