A diamond anvil cell (DAC) which can generate extremely high pressure of multi-megabar is promising tool to develop a further physics such a high-transition temperature superconductivity. However, electrical transport measurements, which is one of the most important properties of such functional materials, using the DAC is quite difficult because the sample space is very small and a deformation of electrodes under extreme condition. In this study, we fabricated a boron-doped diamond micro-electrode and an undoped diamond insulation on a beveled culet surface of the diamond anvil. By using the developed DAC, we demonstrated the electrical transport measurements for sulfur hydride H$_2$S which known as a pressure-induced high-transition temperature superconducting H$_3$S at high pressure. The measurements were successfully conducted under high pressure up to 192 GPa, and then a multi-step superconducting transition composed from pure sulfur and some kinds of surfer hydrides, which is possible HS$_2$, was observed with zero resistance.

中文翻译：

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在斜面金刚石砧上使用掺硼金刚石电极对超导硫氢化物进行电输运测量

可以产生多兆巴的极高压力的金刚石砧座（DAC）是开发进一步物理学（例如高转变温度超导性）的有前途的工具。然而，使用 DAC 作为此类功能材料最重要的特性之一的电传输测量非常困难，因为样本空间非常小，并且在极端条件下电极会变形。在这项研究中，我们在金刚石砧的斜面尖底表面上制造了一个掺硼金刚石微电极和一个未掺杂的金刚石绝缘材料。通过使用开发的 DAC，我们展示了氢化硫 H$_2$S 的电输运测量，它被称为高压下的压力诱导高转变温度超导 H$_3$S。