An application of NPD to double-stage diamond anvil cells: XAS spectra of rhenium metal under high pressures above 300 GPa

ABSTRACT

We present the first application of double-stage diamond anvil cells (ds-DACs) to X-ray absorption spectroscopy (XAS) of Rhenium (Re) metal. By using highly stable and sub-micron sized X-ray beam, XAS spectra were successfully observed at the $L_{2,3}$-edges from the sample encapsulated in the small space between the second-stage anvils. The pressure generation exceeding 300 GPa was evaluated by the pressure-induced shift of extended X-ray absorption fine structure (EXAFS) oscillation at the $L_3$-edge. The profile of white-line at the $L_{2,3}$-edges broadened with increasing pressure, which indicates the modification of the Re $5d$ band structure. The present results demonstrate the high ability of XAS technique combined with ds-DACs as a probe for crystal structure and electronic structure under ultrahigh pressure.

KEYWORDS:

• Double-stage diamond anvil cell
• nano-polycrystalline diamond
• X-ray absorption spectroscopy (XAS)
• glitch
• rhenium metal

Acknowledgments

The XAS measurements presented here were performed at SPring-8 with the approval of PRC-JASRI [Nos. 2018B1361, 2018B2091, 2018B1380, 2019A1520, 2019A1736].

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This study was partially supported by Grant-in-Aid for Scientific Research on Innovative Areas [grant number 15H05829] and JSPS KAKENHI [grant numbers 17H02985, 17K05518].