Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-11-06
Phys. Rev. Lett. 88, 137203 (2002).
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages revtex4 including 3 eps figures
Scientific paper
10.1103/PhysRevLett.88.137203
We propose a method for measuring spin Hamiltonians and apply it to the spin-1/2 Heisenberg antiferromagnet Cs2CuCl4, which shows a 2D fractionalized RVB state at low fields. By applying strong fields we fully align the spin moment of Cs2CuCl4 transforming it into an effective ferromagnet. In this phase the excitations are conventional magnons and their dispersion relation measured using neutron scattering give the exchange couplings directly, which are found to form an anisotropic triangular lattice with small Dzyaloshinskii-Moriya terms. Using the field to control the excitations we observe Bose condensation of magnons into an ordered ground state.
Coldea Radu
Habicht Klaus
Smeibidl P.
Tennant D. A.
Tylczynski Z.
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