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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.25: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

High-field ESR studies of the strong-leg spin-1/2 ladder antiferromagnet DIMPY — •A.N. Ponomaryov¹, J. Wosnitza^{1, 2}, K. Povarov³, D. Schmidiger³, A. Zheludev¹, and S.A. Zvyagin¹ — ¹Hochfeld-magnet Labor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ²Institut für Festkörperphysik, TU Dresden, Dresden, Germany — ³Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH Zürich, Switzerland

We report on high-field ESR studies of the Cu²⁺-based strong-leg spin-1/2 ladder antiferromagnet (C₇H₁₀N)₂CuBr₄ (also known as DIMPY). ESR spectra were measured at frequencies from 58 to 450 GHz at 1.5 K. In addition to the gapped mode observed previously [M. Ozerov et al., Phys. Rev. B 92, 241113(R) (2015)] a fine structure of the gapless mode was revealed. The data were analyzed employing ESR exchange narrowing theory, allowing us to estimate the interladder exchange interaction, J′=77 mK. Further peculiarities of the ESR spectra of DIMPY will be discussed.

This work was partly supported by the DFG.