Physical Review B
Publisher's Note: Quantum spin chain as a potential realization of the Nersesyan-Tsvelik model [Phys. Rev. B90, 060409(R) (2014)]
Christian Balz, B. Lake, Hubertus Luetkens, C. Baines, T. Guidi, Mahmoud Abdel-Hafiez, Anja U. B. Wolter, Bernd Büchner, I. V. Morozov, Evgeniya B. Deeva, О. С. Волкова, A. N. Vasiliev