Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 26: Correlated Magnetism – Frustrated Systems
TT 26.10: Vortrag
Mittwoch, 19. März 2025, 12:00–12:15, H33
Search for Precursors of Multi-Magnon Bound States in Li2CuO2 Single Crystals in Specific Heat Data — •Stefan-Ludwig Drechsler1, Eli Zoghlin2, Wolfram Lorenz1, and Ulrich Roessler1 — 1IFW-Dresden, Dresden, Germany — 2J. Hopkins University, Baltimore, Maryland, USA
We report specific heat cp-data for high quality single crystals of the edge-sharing chain cuprate Li2CuO2 collected in a wide temperature region from 20 to 70 K well above the Ne’el transition TN ≈ 9.2 to 9.4 K at ambient magnetic field. The cp is analyzed within a sensitive cp/T3-plot adopting and generalizing an analytical expression [1] by adding precursor multi-magnon bound state (PMMBS) of any order. This way, the problem of missing intensity around 40 K can be resolved. The obtained excitation energies of PMMBS are in accord with recent inelastic neutron scattering data for Li2CuO2 [2] regarding single-magnon, two-magnon and three-magnon bound states. The results are discussed within the context of a recenly proposed Bose condensation scenario of MMBS [3] at very low temperature and ambient field.
[1] S. Ebisu et al., J. Phys.Chem.Sol. 59, 1407 (1998);
[2] E. Zoghlin et al., PRB 108 064408 (2023);
[3] C.E. Agrapidis, S.-L. Drechsler, S. Nishimoto, arXiv: 2410.00734, Phys. Rev. X (submitted).
Keywords: frustrated magnetism; edge-shared chain cuprate; multi-magnon bound states