It is well established that long-range magnetic order is suppressed in magnetic systems whose interactions are low-dimensional. The prototypical example is the S-1/2 Heisenberg antiferromagnetic chain (S-1/2 HAFC) whose ground state is quantum critical. In real S-1/2 HAFC compounds interchain coupling induces long-range magnetic order although with a suppressed ordered moment and reduced N\'eel temperature compared to the Curie-Weiss temperature. Recently, it was suggested that order can also be suppressed if the interchain interactions are frustrated, as for the Nersesyan-Tsvelik model. Here, we study the new S-1/2 HAFC, (NO)[Cu(NO3)3]. This material shows extreme suppression of order which furthermore is incommensurate revealing the presence of frustration consistent with the Nersesyan-Tsvelik model.
@article{arxiv.1409.1763,
title = {Quantum spin chain as a potential realization of the Nersesyan-Tsvelik model},
author = {C. Balz and B. Lake and H. Luetkens and C. Baines and T. Guidi and M. Abdel-Hafiez and A. U. B. Wolter and B. Büchner and I. V. Morozov and E. B. Deeva and O. S. Volkova and A. N. Vasiliev},
journal= {arXiv preprint arXiv:1409.1763},
year = {2014}
}