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Superconducting super-organized nanoparticles of the superconductor (BEDT-TTF)2Cu(NCS)2
Synthetic Metals ( IF 4.0 ) Pub Date : 2021-07-01 , DOI: 10.1016/j.synthmet.2021.116844
Dominique de Caro , Kane Jacob , Marco Revelli-Beaumont , Christophe Faulmann , Lydie Valade , Marine Tassé , Sonia Mallet-Ladeira , Shuxiang Fan , Tadashi Kawamoto , Takehiko Mori , Jordi Fraxedas

The synthesis of (BEDT-TTF)2Cu(NCS)2 in the presence of poly(ethylene glycol) leads to super-organized nanoparticles of 2–8 nm size. Samples contain crystalline nanoparticles of the κ-(BEDT-TTF)2Cu(NCS)2 phase. The electrical conductivity at room temperature is about 0.08 S · cm–1, a typical value for nanopowders of tetrathiafulvalene-based conducting compounds. The current-voltage characteristic for an individual nanoparticle aggregate is fitted with a Shockley diode model. A saturation current of 4.1 pA and a threshold voltage of 0.45 V are extracted. N1s and S2p lines in X-ray photoelectron spectroscopy evidence a charge transfer, characteristic for tetrathiafulvalene-based conducting salts. Magnetic susceptibility studies show a superconducting transition at 9.1 K, a characteristic value for the κ-(BEDT-TTF)2Cu(NCS)2 phase. The thermoelectric power of the nanopowder is represented by the average //c and //b values for the single-crystal. Finally, resistivity for the nanopowder is nearly flat in the metallic region.



中文翻译:

超导体的超导超组织纳米粒子 (BEDT-TTF) 2 Cu(NCS) 2

(BEDT-TTF) 2 Cu(NCS) 2在聚(乙二醇)存在下的合成导致了 2-8 nm 尺寸的超组织纳米粒子。样品含有κ-(BEDT-TTF) 2 Cu(NCS) 2相的结晶纳米颗粒。室温电导率约为0.08 S · cm –1,四硫富瓦烯基导电化合物纳米粉末的典型值。单个纳米颗粒聚集体的电流-电压特性符合肖克利二极管模型。提取了 4.1 pA 的饱和电流和 0.45 V 的阈值电压。X 射线光电子能谱中的 N1s 和 S2p 线证明了电荷转移,这是基于四硫富瓦烯的导电盐的特征。磁化率研究显示在 9.1 K 处发生超导转变,这是 κ-(BEDT-TTF) 2 Cu(NCS) 2相的特征值。纳米粉体的热电功率由平均值 // c和 // b 表示单晶的值。最后,纳米粉末的电阻率在金属区域几乎是平坦的。

更新日期:2021-07-01
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