High-pressure resistivity technique for quasi-hydrostatic compression experiments

Area of Science:

• Materials Science
• High-Pressure Physics
• Condensed Matter Physics

Background:

• Diamond anvil cells (DACs) are established tools for high-pressure material property measurements.
• High-pressure electrical resistivity measurements are difficult due to electrical contact survival under extreme stress.
• Previous DAC experiments were limited to non-hydrostatic or quasi-hydrostatic pressure media.

Purpose of the Study:

• To present a novel method for achieving hydrostatic pressure conditions in DACs for resistivity measurements.
• To overcome the limitations of non-hydrostatic pressure media in high-pressure experiments.

Main Methods:

• Utilizing focused ion beam (FIB) ultrathin lithography to create electrical leads.
• Depositing ultrathin leads directly onto the diamond culet within the DAC.
• Loading the DAC with inert gases (Neon) as hydrostatic pressure-transmitting media.

Main Results:

• Successfully demonstrated the feasibility of FIB ultrathin lithography for DAC applications.
• Achieved stable electrical contacts that withstand extreme pressures.
• Obtained typical resistivity data under hydrostatic pressure conditions.

Conclusions:

• FIB ultrathin lithography offers a viable solution for high-pressure resistivity measurements in DACs.
• This technique enables the use of hydrostatic pressure media like Neon and Helium.
• Facilitates more accurate material property measurements under true hydrostatic stress.