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                <term xml:lang="en">Nanofibers</term>
                <term xml:lang="en">Acetylene</term>
                <term xml:lang="en">Electric field measurement</term>
                <term xml:lang="en">Electric fields</term>
                <term xml:lang="en">Magnetic fields</term>
                <term xml:lang="en">Charged soliton</term>
                <term xml:lang="en">Polyaniline</term>
                <term xml:lang="en">Solitons</term>
                <term xml:lang="en">Magnetos</term>
                <term xml:lang="en">Polyaniline nanofibers</term>
                <term xml:lang="en">Phase correlation</term>
                <term xml:lang="en">Non-linear</term>
                <term xml:lang="en">Low temperatures</term>
                <term xml:lang="en">High magnetic fields</term>
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              <p>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.</p>
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