Magnetic excitations in the S = 1/2 antiferromagnetic-ferromagnetic chain compound BaCu2V2O8 at zero and finite temperature

Abstract

Unlike most quantum systems which rapidly become incoherent as temperature is raised, strong correlations persist at elevated temperatures in $S=1/2$ dimer magnets, as revealed by the unusual asymmetric lineshape of their excitations at finite temperatures. Here we quantitatively explore and parameterize the strongly correlated magnetic excitations at finite temperatures using the high resolution inelastic neutron scattering on the model compound BaCu${}_2$V${}_2$O${}_8$ which we show to be an alternating antiferromagnetic-ferromagnetic spin$-1/2$ chain. Comparison to state of the art computational techniques shows excellent agreement over a wide temperature range. Our findings hence demonstrate the possibility to quantitatively predict coherent behavior at elevated temperatures in quantum magnets.

arXiv comment5 pages + 6 pages supplement; problems with list of references are fixed

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Cited by in corpus (13)

• Three-body bound states in antiferromagnetic spin ladders
• Multi-triplet bound states and finite-temperature dynamics in highly frustrated quantum spin ladders
• Finite temperature dynamical correlations for the dimerized spin-1/2 chain
• Time-dependent correlations in quantum magnets at finite temperature
• Crystal growth, characterization and phase transition of PbCuTe${}_2$O${}_6$
• Phase diagram of the spin-1/2 Heisenberg alternating chain in a magnetic field
• Composite symmetry protected topological order and effective models
• Low dimensional correlations under thermal fluctuations
• Low-energy spin excitations in field-induced phases of the spin-ladder antiferromagnet BiCu${}_2$PO${}_6$
• Evidence for strong correlations at finite temperatures in the dimerized magnet Na${}_2$Cu${}_2$TeO${}_6$
• Self-consistent T-matrix approach to gap renormalization in quantum magnets with bond disorder
• Anomalous thermal broadening in the Shastry-Sutherland model and SrCu${}_2($BO${}_3{)}_2$
• Effects of Interactions on Dynamic Correlations of Hard-Core Bosons at Finite Temperatures