High pressure effects on La(O,F)BiS$_{\mathrm{2}}$ single crystal using diamond anvil cell with dual-probe diamond electrodes

TL;DR

This study investigates how high pressure affects the electrical transport and vibrational properties of La(O,F)BiS$_{ ext{2}}$ single crystals using a novel diamond anvil cell with dual-probe electrodes, revealing a decrease in transition temperature and phonon hardening.

Contribution

Introduces a new diamond anvil cell with dual-probe electrodes for measuring electrical properties of La(O,F)BiS$_{ ext{2}}$ under high pressure, providing new insights into its superconducting behavior.

Findings

Transition temperature decreases linearly with pressure.

Phonon modes harden under high pressure.

Electrical transport properties were successfully measured at low temperature.

Abstract

The high-pressure phase of La(O,F)BiS$_{\mathrm{2}}$ exhibits the highest transition temperature among all the BiS$_{\mathrm{2}}$-based superconductors. Various studies, such as investigation of isotope effects, have been conducted to explain its superconducting mechanism. However, there are very few reports on the electrical transport properties and vibration modes of single crystalline La(O,F)BiS$_{\mathrm{2}}$ under high pressure. In this study, we developed a diamond anvil cell with dual-probe diamond electrodes to measure the electrical transport properties of La(O,F)BiS$_{\mathrm{2}}$ single crystal and Pb as a manometer at low temperature. Using the developed system, a linear decrease in the transition temperature and phonon hardening was observed under the application of pressure on La(O,F)BiS$_{\mathrm{2}}$ single crystal.