Radio-Frequency Gasket for Studies of Superconductivity in Diamond Anvil Cells

TL;DR

This paper introduces a novel RF gasket with a Lenz lens surface for contactless superconductivity measurements in diamond anvil cells, overcoming previous limitations by transferring the RF sensor to a composite gasket.

Contribution

It presents a new RF gasket design with a Lenz lens topology on a Ta-based composite gasket, enabling contactless high-pressure superconductivity studies.

Findings

Validated the gasket with superconductors Cu1234 and Bi2212 at various pressures.

Successfully identified superconducting transition temperatures across a wide frequency range.

Abstract

This work presents the development and testing of a novel radio-frequency (RF) gasket with a Lenz lens surface geometry for contactless measurements in diamond anvil cells (DACs). Conventional RF approaches, which fabricate the Lenz lens onto the diamond anvil itself, preclude the placement of electrical circuits. Our method overcomes this limitation by transferring the RF sensor to a composite Ta-based gasket. The sensor consists of single-turn microcoils that are formed by magnetron sputtering a gold film onto an insulating Ta$_2$O$_5$ layer. The Lenz lens topology is then patterned using focused ion beam etching. We validated this technique using polycrystalline Cu1234 and Bi2212 high-$\textit{T$_c$}$ superconductors at ambient and high pressures. The measurements consistently identified the superconducting transition temperature across carrier frequencies from 111 kHz to 200 MHz. This new gasket technique establishes a reliable and sensitive tool for contactless studies of superconductivity under high pressure.