The coupled spin-1 chains material NiCl2-4SC(NH2)2 (DTN) doped with Br impurities is expected to be a perfect candidate for observing many-body localization at high magnetic field: the so-called "Bose glass", a zero-temperature bosonic fluid, compressible, gapless, incoherent, and short-range correlated. Using nuclear magnetic resonance (NMR), we critically address the stability of the Bose glass in doped DTN, and find that it hosts a novel disorder-induced ordered state of matter, where many-body physics leads to an unexpected resurgence of quantum coherence emerging from localized impurity states. An experimental phase diagram of this new "order-from-disorder" phase, established from NMR T1−1 relaxation rate data in the (13 ± 1)% Br-doped DTN, is found to be in excellent agreement with the theoretical prediction from large-scale quantum Monte Carlo simulations.
@article{arxiv.1801.01445,
title = {Detection of a Disorder-Induced Bose-Einstein Condensate in a Quantum Spin Material at High Magnetic Fields},
author = {A. Orlova and H. Mayaffre and S. Krämer and M. Dupont and S. Capponi and N. Laflorencie and A. Paduan-Filho and M. Horvatić},
journal= {arXiv preprint arXiv:1801.01445},
year = {2018}
}