Alexey Tiranov, Emanuel Green, Sophie Hermans, Erin Liu, Federico Chiossi, Diana Serrano, Pascal Loiseau, Achuthan Manoj Kumar, Sylvain Bertaina, Andrei Faraon, Philippe Goldner. "Sub-second spin and lifetime-limited optical coherences in 171Yb3+:CaWO4." Nature Communications, 2026. doi:10.1038/s41467-026-70534-9