Optical Raman measurements of low frequency magnons under high pressure
The application of giga-Pascal scale pressures has been widely used as a tool to systematically tune the properties of materials in order to access such general questions as the driving mechanisms underlying phase transitions. While there is a large and growing set of experimental tools successfully applied to high-pressure environments, the compatibility between diamond anvil cells and optical probes offers further potential for examining lattice, magnetic, and electronic states, along with their excitations. Here, we describe the construction of a highly efficient optical Raman spectrometer that enables measurements of magnetic excitations in single crystals down to energies of 9 cm⁻¹ (1.1 meV or 13 K) at cryogenic temperatures and under pressures of tens of GPa.
Additional Information© 2020 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0). Submitted: 23 August 2020; Accepted: 18 October 2020; Published Online: 4 November 2020. The authors thank D. Hsieh for the use of Sr₂IrO₄ single crystal samples. Y.F. acknowledges support from the Okinawa Institute of Science and Technology Graduate University (OIST), with subsidy funding from the Cabinet Office, Government of Japan. The authors also acknowledge the Mechanical Engineering and Microfabrication Support Section of OIST for technical support. The work at Caltech was supported by AFOSR Grant No. FA9550-20-1-0263. Data Availability: The data that support the findings of this study are available from the corresponding author upon reasonable request.
Published - 5.0026311.pdf