Identification of strongly correlated spin liquid in herbertsmithite V. R. Shaginyan, A. Z. Msezane, K. G. Popov, G. S. Japaridze and V. A. Stephanovich EPL, 97 5 (2012) 56001 Published online: 01 March 2012 DOI: 10.1209/0295-5075/97/56001