Hälg, M.; Hüvonen, D.; Guidi, T.; Quintero Castro, D. L.; Boehm, M.; Regnault, L. P.; Hagiwara, M.; Zheludev, A.: Finite-temperature scaling of spin correlations in an experimental realization of the one-dimensional Ising quantum critical point. Physical Review B 92 (2015), p. 014412/1-7
10.1103/PhysRevB.92.014412

Abstract:
Inelastic neutron scattering is used to study the finite-temperature scaling behavior of the local dynamic structure factor in the quasi-one-dimensional quantum antiferromagnet Ni[N,N′−bis(3-aminopropyl)propane-1,3-diamine](μ−NO2)ClO4 (NTENP), at its field-induced Ising quantum critical point. The validity and the limitations of the theoretically predicted scaling relations are tested