Adapting a continuous flow cryostat and a plate DAC to do high pressure Raman experiments at low temperatures

Smita Gohil; Shankar Ghosh; Satej Tare; Abhishek Chitnis; Nandini Garg

doi:10.1063/5.0050860

Adapting a continuous flow cryostat and a plate DAC to do high pressure Raman experiments at low temperatures

Rev Sci Instrum. 2021 Dec 1;92(12):123902. doi: 10.1063/5.0050860.

Authors

Smita Gohil¹, Shankar Ghosh¹, Satej Tare², Abhishek Chitnis³, Nandini Garg³

Affiliations

¹ Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India.
² Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India.
³ High Pressure Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.

PMID: 34972466
DOI: 10.1063/5.0050860

Abstract

We present a method for modifying a continuous flow cryostat and a steel plate DAC (Diamond Anvil Cell) to perform high pressure micro-Raman experiments at low temperatures. Despite using a steel DAC with a lower specific heat capacity (∼335 J/kg K), this setup can routinely perform high pressure (∼10 GPa) measurements at temperatures as low as 26 K. This adaptation is appropriate for varying the temperature of the sample while keeping it at a constant pressure. We determined that the temperature variation across the sample chamber is about 1 K using both direct temperature measurements and finite element analysis of the heat transport across the DAC. We present Raman spectroscopy results on elemental selenium at high pressures and low temperatures using our modified setup.