Electrical transport measurements for superconducting sulfur hydrides using boron-doped diamond electrodes on beveled diamond anvil
Electrical transport measurements for superconducting sulfur hydrides using boron-doped diamond electrodes on beveled diamond anvil
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DOI：
10.1088/1361-6668/abbdc5
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发表时间：
2020-06
影响因子：
3.6
通讯作者：
R. Matsumoto;M. Einaga;S. Adachi;Sayaka Yamamoto;T. Irifune;K. Terashima;H. Takeya;Y. Nakamoto
中科院分区：
文献类型：
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作者：
R. Matsumoto;M. Einaga;S. Adachi;Sayaka Yamamoto;T. Irifune;K. Terashima;H. Takeya;Y. Nakamoto
金刚石砧细胞（DAC）已经成为研究在极高压力下发生的物理现象的有效工具，例如高转变温度超导性。用于表征超导材料最重要特性之一的电输运测量，很难用传统的dac进行。传统dac中可用的样品空间非常小，并且在极端操作条件下存在电极变形的额外风险。为了克服这些限制，我们在此报道了在金刚石砧的斜面凹槽表面上制备掺硼金刚石微电极和未掺杂金刚石绝缘体的方法。利用新开发的DAC，我们对硫化物H2S进行了原位电输运测量，H2S是众所周知的压力诱导、高转变温度超导硫化物H3S的前驱体。这些测量在高达192 GPa的高压下进行，表明存在多步超导转变，我们将其归因于单质硫和可能的HS2。
A diamond anvil cell (DAC) has become an effective tool for investigating physical phenomena that occur at extremely high pressure, such as high-transition temperature superconductivity. Electrical transport measurements, which are used to characterize one of the most important properties of superconducting materials, are difficult to perform using conventional DACs. The available sample space in conventional DACs is very small and there is an added risk of electrode deformation under extreme operating conditions. To overcome these limitations, we herein report the fabrication of a boron-doped diamond microelectrode and undoped diamond insulation on a beveled culet surface of a diamond anvil. Using the newly developed DAC, we have performed in-situ electrical transport measurements on sulfur hydride H2S, which is a well-known precursor of the pressure-induced, high-transition temperature superconducting sulfur hydride, H3S. These measurements conducted under high pressures up to 192 GPa, indicated the presence of a multi-step superconducting transition, which we have attributed to elemental sulfur and possibly HS2.