Magnetic field and pressure effects on charge density wave, superconducting, and magnetic states in Lu$_5$Ir$_4$Si$_{10}$ and Er$_5$Ir$_4$Si$_{10}$

TL;DR

This study investigates how magnetic field and pressure influence charge density waves, superconductivity, and magnetic states in Lu$_5$Ir$_4$Si$_{10}$ and Er$_5$Ir$_4$Si$_{10}$, revealing distinct pressure effects on their electronic phases.

Contribution

It provides detailed experimental insights into the pressure and magnetic field dependence of CDW, superconducting, and magnetic states in these two related compounds.

Findings

Pressure suppresses CDW in Lu$_5$Ir$_4$Si$_{10}$ and weakly enhances superconductivity.

In Er$_5$Ir$_4$Si$_{10}$, pressure affects the commensurate CDW and slightly depresses antiferromagnetic order.

Er$_5$Ir$_4$Si$_{10}$ exhibits negative magnetoresistance at low temperatures.

Abstract

We have studied the charge-density-wave (CDW) state for the superconducting Lu$_5$Ir$_4$Si$_{10}$ and the antiferromagnetic Er$_5$Ir$_4$Si$_{10}$ as variables of temperature, magnetic field, and hydrostatic pressure. For Lu$_5$Ir$_4$Si$_{10}$, the application of pressure strongly suppresses the CDW phase but weakly enhances the superconducting phase. For Er$_5$Ir$_4$Si$_{10}$, the incommensurate CDW state is pressure independent and the commensurate CDW state strongly depends on the pressure, whereas the antiferromagnetic ordering is slightly depressed by applying pressure. In addition, Er$_5$Ir$_4$Si$_{10}$ shows negative magnetoresistance at low temperatures, compared with the positive magnetoresistance of Lu$_5$Ir$_4$Si$_{10}$.