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首页> 外文期刊>Physical review >Interplay between spin-density wave and 3d local moments with random exchange in a molecular conductor
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Interplay between spin-density wave and 3d local moments with random exchange in a molecular conductor

机译：自旋密度波与3d局部矩之间的相互作用以及分子导体中的随机交换

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We present the results of high-pressure transport measurements on the anion-mixed molecular conductors (DIETSe)_2MBr_2Cl_2 [DIETSe = diiodo(ethylenedithio)tetraselenafulvalene; M = Fe, Ga]. They undergo a metal-insulator (M-I) transition below 9 K at ambient pressure, which is suppressed by applying pressure, indicating a spin-density-wave (SDW) transition caused by a nesting instability of the quasi-one-dimensional (Q1D) Fermi surface, as observed in the parent compounds (DIETSe)_2MCl_4 (M = Fe, Ga). In the metallic state, the existence of the Q1D Fermi surface is confirmed by observing the Lebed resonance. The critical pressures of the SDW, P_c, of the MBr_2Cl_2 (M = Fe, Ga) salts are significantly lower than those of the the MCl_4 (M = Fe, Ga) salts, suggesting chemical pressure effects. Above P_c, field-induced SDW transitions appear, as evidenced by kink structures in the magnetoresistance (MR) in both salts. The FeBr_2Cl_2 salt also shows antiferromagnetic (AF) ordering of d spins at 4 K, below which significant spin-charge coupling is observed. A large positive MR change up to 150% appears above the spin-flop field at high pressure. At low pressure, in particular below P_c, a dip or kink structure appears in MR at the spin-flop field, which shows unconventionally large hysteresis at low temperature (T ＜ 1 K). The hysteresis region clearly decreases with increasing pressure towards P_c, strongly indicating that the coexisting SDW plays an important role in the enhancement of magnetic hysteresis besides the random exchange interaction.
机译：我们提出了在阴离子混合分子导体（DIETSe）_2MBr_2Cl_2 [DIETSe =二碘（亚乙基二硫代）四硒富勒烯上的高压传输测量结果； M ＝ Fe，Ga]。它们在环境压力下经历低于9 K的金属-绝缘体（MI）转变，这可以通过施加压力来抑制，这表明由准一维（Q1D）的嵌套不稳定性引起的自旋密度波（SDW）转变费米表面，如在母体化合物（DIETSe）_2MCl_4（M = Fe，Ga）中观察到的。在金属状态下，通过观察Lebed共振可确认Q1D Fermi表面的存在。 MBr_2Cl_2（M = Fe，Ga）盐的SDW的临界压力P_c明显低于MCl_4（M = Fe，Ga）盐的临界压力，表明存在化学压力效应。在P_c上方，会出现场感应的SDW跃迁，这两种盐的磁阻（MR）的扭结结构都证明了这一点。 FeBr_2Cl_2盐在4 K时还显示d自旋的反铁磁（AF）有序，在此之下可观察到明显的自旋电荷耦合。在高压下，在旋转场上方会出现高达150％的大正MR变化。在低压下，特别是在P_c以下，在旋转磁场中MR中会出现倾角或扭结结构，在低温下（T ＜1 K）表现出异常大的磁滞现象。磁滞区域随着向P_c压力的增加而明显减小，这强烈表明，除了随机交换相互作用之外，并存的SDW在增强磁滞方面也起着重要作用。

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  • 来源
    《Physical review》 |2016年第7期|075124.1-075124.6|共6页
  • 作者

    Genta Kawaguchi; Mitsuhiko Maesato; Tokutaro Komatsu; Tatsuro Imakubo; Hiroshi Kitagawa;

  • 作者单位

    Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan;

    Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan;

    Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan;

    Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan;

    Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan;

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