Diffuson-driven ultralow thermal conductivity in amorphous N b 2 O 5 thin films - Cheng, Zhe; Weidenbach, Alex; Feng, Tianli; Tellekamp, M Brooks; Howard, Sebastian; Wahila, Matthew J; Zivasatienraj, Bill; Foley, Brian; Pantelides, Sokrates T; Piper, Louis FJ (Physical Review Materials, 2019)