Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet by Banerjee, A, Bridges, CA, Yan, J-Q, Aczel, AA, Li, L, Stone, MB, Granroth, GE, Lumsden, MD, Yiu, Y, Knolle, J, Bhattacharjee, S, Kovrizhin, DL, Moessner, R, Tennant, DA, Mandrus, DG, Nagler, SE