Observation of a gapped phase in the one-dimensional S=12 Heisenberg antiferromagnetic chain Cu(Ampy)ClBrRemoveSaikat Nandi, Monika Jawale, Sanjay Bachhar, Rahul Kumar, Marlis Schuller, Rabindranath Bag, J. M. Wilkinson, Jörg Sichelschmidt, A. Sundaresan, Sara Haravifard, N. Büttgen, and A. V. MahajanPhys. Rev. B 112, 134437 (2025)
