Abstract
Electrical and magnetic sensors can be lithographically fabricated on top of diamond substrates and encapsulated in a protective layer of chemical vapor deposited single crystalline diamond. This process when carried out on single crystal diamond anvils employed in high pressure research is termed as designer diamond anvil fabrication. These designer diamond anvils allow researchers to study electrical and magnetic properties of materials under extreme conditions without any possibility of damaging the sensing elements. We describe a novel method for the fabrication of designer diamond anvils with the use of maskless lithography and chemical vapor deposition in this paper. This method can be utilized to produce diamond based sensors which can function in extreme environments of high pressures, high and low temperatures, corrosive and high radiation conditions. We demonstrate applicability of these diamonds under extreme environments by performing electrical resistance measurements during superconducting transition in rare earth doped iron-based compounds under high pressures to 12 GPa and low temperatures to 10 K.
Highlights
The static high pressure study on materials generally requires the use of single crystal diamonds in an opposed anvil configuration in diamond anvil cell devices
A diamond anvil with a central flat size of 70 microns in diameter, beveled at 7.5 degrees to a culet size of 350 microns in diameter has been chosen as base substrate for the fabrication of a designer diamond anvil
The first step in the fabrication of this designer diamond was completed after developing the photoresist, and wet etching step to remove tungsten from unwanted areas
Summary
The static high pressure study on materials generally requires the use of single crystal diamonds in an opposed anvil configuration in diamond anvil cell devices. The use of designer diamond anvils in diamond anvil cell allows us to use a metallic gasket for sample containment and for precise four-probe electrical resistance measurements This is helpful in observing how superconductivity changes as a function of pressure in compounds such as 1-2-2 iron (Fe)-based materials AFe2As2 (122) [A = Ba, Sr, Ca, Eu]. High pressure superconductivity in a rare-earth-doped Ca0.86Pr0.14Fe2As2 single-crystalline sample has been studied up to 12 GPa and temperatures down to 11 K using the designer diamond anvil previously [7]. These superconducting compounds are of particular interest because under pressure, superconducting transition temperature (Tc) as high as ~51 K at 1.9 GPa has been observed, presenting the highest Tc reported in the intermetallic class of 1-2-2 iron-based superconductors. In this paper we report results from our study on a rare-earth doped iron-based superconductor Ca0.9Pr0.1Fe2As2 using a newly fabricated designer diamond anvil
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
