High pressure effects on La(O,F)BiS${}_2$ single crystal using diamond anvil cell with dual-probe diamond electrodes

Abstract

The high-pressure phase of La(O,F)BiS${}_2$ exhibits the highest transition temperature among all the BiS${}_2$-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${}_2$ 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${}_2$ 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${}_2$ single crystal.