Suppression of the magneto resistance in high electric fields of polyacetylene nanofibers
Suppression of the magneto resistance in high electric fields of polyacetylene nanofibers
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DOI：
10.1016/j.synthmet.2010.04.014
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发表时间：
2010-06-01
期刊：
影响因子：
4.4
通讯作者：
Park, Y. W.
中科院分区：
文献类型：
--
作者：
Choi, A.;Lee, H. J.;Park, Y. W.
本文报道了聚乙炔纳米纤维在低温T=1.5K、磁场高达H=30T时的非线性磁阻(MR)的研究结果，证明了MR是自旋的起源：在最高的H时达到16%。出乎意料的是，增加电场E抑制了MR。可以理解的是，掺杂诱导了无自旋的带电孤子对，由于链间的位相关联，它们最初被限制在一定的距离内，并在高电场中解禁闭，导致磁阻(VMR)的消失。通过对聚苯胺纳米纤维的不同磁阻的平行研究证实了聚乙炔的特殊简并基态的作用，而聚苯胺纳米纤维不受电场的影响。(C)2010爱思唯尔B.V.保留所有权利。
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 greater than or similar to 5 x 10(4) 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. (C) 2010 Elsevier B.V. All rights reserved.