NMR-EPR-DNP-papers @nmr-epr-dnp-papers.bsky.social · 31/08/2026#NMRchat Role of defects in the paramagnetism of Fe-doped ${\mathrm{Cs}}_{2}{\mathrm{AgBiBr}}_{6}$ double perovskite link.aps.org/doi/10.1103/dvyv-893w 000