• Liu, X.; Prokhnenko, O.; Yamamoto, D.; Bartkowiak, M.; Kurita, N.; Tanaka, H.: Microscopic evidence of a quantum magnetization process in the S=½ triangular-lattice Heisenberg-like antiferromagnet Ba3CoSb2O9. Physical Review B 100 (2019), p. 094436/1-8

10.1103/PhysRevB.100.094436
Open Access Version

Abstract:
We report results of the neutron scattering investigations of frustrated quantum magnet Ba3CoSb2O9 in magnetic fields up to 25.9 T. Contrary to other materials, Ba3CoSb2O9 exhibits properties typical of an ideal S=12 triangular lattice Heisenberg antiferromagnet, making it a perfect model system for testing theoretical predictions. In this work, we looked into the magnetization process in Ba3CoSb2O9 on a microscopic scale with a magnetic field applied in plane. A sequence of magnetic phase transitions, including the new high-field phase at 22.5 T reported recently has been followed at low temperatures as a function of field and modeled using the large-size cluster mean-field plus scaling method. Showing good agreement with the model, our results bridge the theory and the experiment providing microscopic information about the high-field spin ordering in S=12 triangular lattice Heisenberg-like antiferromagnet Ba3CoSb2O9.