Susceptibility of the quasi-one-dimensional electrons in a periodic potential

The effects of the strength (V) of the potential caused by the anion ordering on the field-induced spin density wave (FISDW) in the quasi-one dimensional organic superconductor (TMTSF)2ClO4 is studied theoretically. From the result of the susceptibility (χ0(Q)) in the absence of the magnetic field, we show that the position of the largest peak of χ0(Q) at B = 0 continuously changes from Q ≃ Q0 + q4 to Q ≃ Q0 + q3 upon increasing V, whereq4=(1ℏνF24tb′1+128(tb′tb)2+1,±2bsin−1[8(tb′tb)1+128(tb′tb)2+1])andq3=(1ℏνF(4tb′+4t4),0).This change of the maximum peak at B = 0 is related to the stability of FISDW.

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