Author/Authors :
Choi، نويسنده , , A. and Lee، نويسنده , , H.J. and Kaiser، نويسنده , , A.B. and Jhang، نويسنده , , S.H. Tony Lee، نويسنده , , S.H and Yoo، نويسنده , , J.S. and Kim، نويسنده , , H.S. and Nam، نويسنده , , Y.W. and Park، نويسنده , , S.J. and Yoo، نويسنده , , H.N. and Aleshin، نويسنده , , A.N. and Goh، نويسنده , , M. and Akagi، نويسنده , , K. and Kaner، نويسنده , , R.B. and Brooks، نويسنده , , J.S. and Svensson، نويسنده , , J. and Brazovskii، نويسنده , , S.A.، نويسنده ,
Abstract :
We present results of non-linear magneto resistance (MR) of polyacetylene nanofibers in high magnetic field up to H = 30 T at low temperature T = 1.5 K. The MR was proven to be of the spin origin; it reaches 16% at highest H. Unexpectedly, the MR was suppressed by increasing electric field E, vanishing at E ≳ 5 × 104 V/cm. It is understood that the doping induced spinless charged soliton pairs, which are initially confined to a certain distance because of the interchain phase correlations, and are deconfined in high electric fields, resulting in a vanishing magneto resistance (VMR). The role of the specific, degenerate ground state of the polyacetylene is confirmed by parallel studies of the different magneto resistances of polyaniline nanofibers which contrarily is not affected by the electric field.
