Extended quantum critical phase in a magnetized spin-1/2 antiferromagnetic chain

Details Extended quantum critical phase in a magnetized spin-1/2 antiferromagnetic chain Extended quantum critical phase in a magnetized spin-1/2 antiferromagnetic chain

2003-03-18

arxiv.org/abs/cond-mat/0303364v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.91.037205

Measurements are reported of the magnetic field dependence of excitations in the quantum critical state of the spin S=1/2 linear chain Heisenberg antiferromagnet copper pyrazine dinitrate (CuPzN). The complete spectrum was measured at k_B T/J <= 0.025 for H=0 and H=8.7 Tesla where the system is ~30% magnetized. At H=0, the results are in quantitative agreement with exact calculations of the dynamic spin correlation function for a two-spinon continuum. At high magnetic field, there are multiple overlapping continua with incommensurate soft modes. The boundaries of these continua confirm long-standing predictions, and the intensities are consistent with exact diagonalization and Bethe Ansatz calculations.

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