Determine the pressure range of bulk superconductivity in ReO3

Determine the pressure range over which superconductivity in compressed ReO3 is genuinely bulk rather than filamentary or percolative.

Background

The paper investigates pressure-induced superconductivity in ReO3 and correlates its occurrence with structural phase transitions. Although transport measurements show a superconducting signature over a relatively broad pressure interval, magnetic susceptibility and trapped-flux measurements indicate that substantial bulk superconductivity occurs only within a narrower range. The authors explicitly identify the precise pressure interval distinguishing bulk superconductivity from filamentary or percolative conduction as unresolved.

References

Several questions nevertheless remain regarding the superconducting (SC) and structural evolution of ReO3 under high pressure. First, the pressure range over which SC is of the bulk nature, rather than filamentary or percolative, has not been fully clarified.

— The observation of bulk superconductivity in Rhombohedral ReO3 under pressure  (2609.26628 - Huyan et al., 22 Sep 2026) in Introduction