Electrical transport measurements for superconducting sulfur hydrides using boron-doped diamond electrodes on beveled diamond anvil

Abstract

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.

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Cited by in corpus (9)

• Resistive transition of hydrogen-rich superconductors
• Universal Fermi velocity in highly compressed hydride superconductors
• Diamond anvil cell with boron-doped diamond heater for high-pressure synthesis and in-situ transport measurements
• Quantifying the charge carrier interaction in metallic twisted graphene superlattices
• The electron-phonon coupling constant, the Fermi temperature and unconventional superconductivity in the carbonaceous sulfur hydride 190 K superconductor
• A-15 type superconducting hydride $L{a}_4{H}_{23}$: Nanograined structure with low strain, strong electron-phonon interaction, and moderate level of nonadiabaticity
• Comparison of highly-compressed C2/m-SnH12 superhydride with conventional superconductors
• Structural and superconducting parameters of highly compressed sulfur
• Enhancement of superconductivity on thin film of Sn under high pressure