Phys. Rev. B 79, 060404(R) (2009) [4 pages]Dimensional crossover in a spin-liquid-to-helimagnet quantum phase transition
See accompanying Physics Synopsis 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 β≈0.235 and ν≈0.34 at Hc≈3.7 T point to an unusual subcritical scaling regime and may reflect the chiral nature of the quantum critical point. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.060404
DOI:
10.1103/PhysRevB.79.060404
PACS:
75.10.Jm, 75.25.+z, 75.50.Ee
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