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University of Cambridge > Talks.cam > Theory of Condensed Matter > Field-induced Multi-Q⃗ States in a Pyrochlore Heisenberg Magnet
![]() Field-induced Multi-Q⃗ States in a Pyrochlore Heisenberg MagnetAdd to your list(s) Download to your calendar using vCal
If you have a question about this talk, please contact Bo Peng. In this talk, I will present a recent work on the J1-J3b classical Heisenberg model on the pyrochlore lattice in the presence of a magnetic field. We construct exact ground states of the model, which are non-coplanar multi-Q⃗ spin configurations with a large magnetic unit cell. Using linear spin wave theory, we show that entropy favours these multi-Q⃗ states at low temperatures in high magnetic fields. This is confirmed by Monte Carlo simulations, which we also use to map out a phase diagram. Lastly, we calculate the zero-temperature dynamical structure factor. Besides the usual Goldstone modes associated with the ordering Q⃗s, we find high-intensity gapless modes at momenta where there are no Bragg peaks. This talk is part of the Theory of Condensed Matter series. This talk is included in these lists:
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