Construction of a thermal conductivity measurement system for small single crystals of organic conductors
Construction of a thermal conductivity measurement system for small single crystals of organic conductors
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DOI：
10.1007/s10973-018-7799-1
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发表时间：
2018-10
影响因子：
4.4
通讯作者：
Tetsuya Nomoto;S. Imajo;S. Yamashita;H. Akutsu;Y. Nakazawa;A. Krivchikov
中科院分区：
文献类型：
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作者：
Tetsuya Nomoto;S. Imajo;S. Yamashita;H. Akutsu;Y. Nakazawa;A. Krivchikov
我们新搭建了一套分子化合物单晶热导率测量系统。该系统使我们能够测量长度小于1.0 mm的样品的导热系数。为了评价分子基材料中相变的探测能力，我们测量了有机导体α-(BEDT-TTf)2I3和κ-(BEDT-TTf)2Cu[N(CN)2]BR单晶的热导率，其中BEDT-TTf表示双(乙二硫基)四硫富瓦烯。从α-(BEDT-TTf)2I3的导热系数随温度的变化，我们成功地观察到了κ(T)在135℃时突然下降的金属-绝缘体转变。在κ-(BEDT-TTf)2Cu[N(CN)2]Br.的导热系数随温度的变化中，我们可以观察到κ(T)在金属-超导转变(T_c= 11.4K)上的增加.这些结果表明，新开发的系统具有足够高的性能来检测分子化合物小晶体中的各种相变。
We newly constructed a thermal conductivity measurement system for single crystals of molecular compounds. This system enables us to measure the thermal conductivity of samples with the length of less than 1.0 mm. In order to evaluate the capability of detection of phase transitions occurred in molecule-based materials, we performed the thermal conductivity measurement of single crystals of organic conductors α-(BEDT-TTF)2I3and κ-(BEDT-TTF)2Cu[N(CN)2]Br, where BEDT-TTF denotes bis(ethylenedithio)tetrathiafulvalene. From the temperature dependence of the thermal conductivity of α-(BEDT-TTF)2I3, we succeeded in observing the metal–insulator transition as a sudden drop ofκ(T) at 135 K. In the temperature dependence of thermal conductivity of κ-(BEDT-TTF)2Cu[N(CN)2]Br, we could observe the increment ofκ(T) at the metal-superconducting transition (Tc= 11.4 K). These results show that the newly developed system has high performance enough to detect various kinds of phase transitions in small crystals of molecular compounds.