Dimensional crossover in a spin liquid to helimagnet quantum phase transition

Details Dimensional crossover in a spin liquid to helimagnet quantum phase transition Dimensional crossover in a spin liquid to helimagnet quantum phase transition

2008-07-10

arxiv.org/abs/0807.1571v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

10.1103/PhysRevB.79.060404

Neutron scattering is used to study magnetic field induced ordering in the quasi-1D quantum spin-tube compound Sul--Cu$_2$Cl$_4$ that in zero field has a non-magnetic 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 $\beta\approx0.235$ and $\nu\approx0.34$ at $H_c\approx3.7$ T point to an unusual sub-critical scaling regime and may reflect the chiral nature of the quantum critical point.

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