Spatially resolved optical spectroscopy in extreme environment of low temperature, high magnetic fields and high pressure

TL;DR

This paper introduces a novel experimental setup enabling optical spectroscopy with micrometer spatial resolution under extreme conditions of low temperature, high magnetic field, and high pressure, facilitating detailed phase diagram exploration of condensed matter systems.

Contribution

The paper presents a unique experimental platform that independently tunes temperature, magnetic field, and pressure for optical spectroscopy in extreme environments, allowing advanced material investigations.

Findings

Successful implementation of the setup for Raman and photoluminescence measurements.

Application to FePS3 demonstrates capability to study low-dimensional magnetic materials.

Potential to explore phase transitions and low-energy excitations in various condensed matter systems.

Abstract

We present an experimental set-up developed to perform optical spectroscopy experiments (Raman scattering and photoluminescence measurements) with a micrometer spatial resolution, in an extreme environment of low temperature, high magnetic field and high pressure. This unique experimental setup, to the best of our knowledge, allows us to explore deeply the phase diagram of condensed matter systems by tuning independently these three thermodynamic parameters, while monitoring the low-energy excitations (electronic, phononic or magnetic excitations), to spatially map the Raman scattering response or to investigate objects with low dimensions. We apply this technique to bulk FePS3, a layered antiferromagnet with a Neel temperature of T = 120 K.