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TT: Fachverband Tiefe Temperaturen
TT 33: Correlated Magnetism – Spin Liquids
TT 33.2: Vortrag
Mittwoch, 19. März 2025, 15:15–15:30, H33
Higher-Rank Spin Liquids and Spin Nematics from Competing Orders in Pyrochlore Magnets — •Niccolò Francini, Lukas Janssen, and Daniel Lozano-Gómez — Institut für Theoretische Physik and Würzburg-Dresden Cluster of Excellence ct.qmat, TU Dresden, 01062 Dresden, Germany
Pyrochlore magnets have proven to provide an excellent arena for the realization of a variety of many-body phenomena such as classical and quantum order-by-disorder, as well as spin liquid phases described by emergent gauge field theories. These phenomena arise from the competition between different symmetry-breaking magnetic orders. In this work, we consider a subspace of the most general bilinear nearest-neighbor Hamiltonian on the pyrochlore lattice, parameterized by the local interaction parameter Jz±, where three symmetry-breaking phases converge. We demonstrate that for small values of |Jz±|, a conventional q=0 ordered phase is selected by a thermal order-by-disorder mechanism. For |Jz±| above a certain finite threshold, a novel spin-nematic phase is stabilized at low temperatures. Instead of the usual Bragg peaks, the spin-nematic phase features lines of high intensity in the spin structure factor. At intermediate temperatures above the low-temperature orders, a rank-2 U(1) classical spin liquid is realized for all Jz± ≠ 0. We fully characterize all phases using classical Monte-Carlo simulations and a self-consistent Gaussian approximation.
Keywords: pyrochlore lattice; nematic order; spin liquids