Abstract
Neutron scattering is used to study magnetic-field-induced ordering in the quasi-one-dimensional quantum spin-tube compound ${\text{Sul-Cu}}_{2}{\text{Cl}}_{4}$ 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 $\ensuremath{\beta}\ensuremath{\approx}0.235$ and $\ensuremath{\nu}\ensuremath{\approx}0.34$ at ${H}_{c}\ensuremath{\approx}3.7\text{ }\text{T}$ point to an unusual subcritical scaling regime and may reflect the chiral nature of the quantum critical point.
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