Garlea, V.O. ; Zheludev, A. ; Habicht, K. ; Meissner, M. ; Grenier, B. ; Regnault, L.-P. ; Ressouche, E.: Dimensional crossover in a spin-liquid-to-helimagnet quantum phase transition. Physical Review B 79 (2009), p. 060404(R)/1-4
10.1103/PhysRevB.79.060404
Abstract:
Neutron scattering is used to study magnetic-field-induced ordering in the quasi-one-dimensional quantum spin-tube compound Sul-Cu2Cl4 that in zero field has a nonmagnetic spin-liquid ground state. The experiments reveal an incommensurate chiral high-field phase stabilized by a geometric frustration of the magnetic interactions. The measured critical exponents 0.235 and 0.34 at Hc3.7 T point to an unusual subcritical scaling regime and may reflect the chiral nature of the quantum critical point.