Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 42: Correlated Electrons: Frustrated Magnets - Cu-based Systems & FeCr

TT 42.11: Vortrag

Mittwoch, 9. März 2016, 12:15–12:30, H18

Theoretical Aspects of Quantum Magnetism in LiSbCuO₄ — •Satoshi Nishimoto¹, Stefan-Ludwig Drechsler¹, Ullrich Roessler¹, Roman Kuzian², Johannes Richter³, and Helge Rosner⁴ — ¹ITF at the Leibniz Institute IFW-Dresden, 01171 Dresden, Germany — ²IPMS, Kiev, Ukraine — ³University of Magdeburg, Germany — ⁴MPI-cPfS, Dresden, Dresden

We apply various theoretical methods (DMRG, LDA+U, equation of motion for hard-core bosons, complete diagonalizations, and a full symmetry analysis) to model the recently discovered novel frustrated edge-shared chain cuprate LiSbCuO₄ [1] in terms of isotropic and anisotropic interacting J₁-J₁′-J₂ chains including also interchain coupling. Special attention is paid to possible field induced multipolar phases near the saturation field and the remarkable interplay of possible nematicity with symmetric and antisymmetric exchange anisotropy. In particular, the main exchange intra and interchain couplings are estimated, the nature and the role of weak Dzyaloshinskii-Moriya interactions allowed by the low crystal symmetry as well as disorder effects caused by the Li-split positions are adressed,too. Various thermodynamic properties such as magnetization and magnetic specific heat are calculated and compare well with available experimental data. LiSbCuO₄ is found to be one of the most challenging edge-shared cuprates with unusual physical properties.
S.E. Dutton et al., PRL 108, 187206 (2012).