Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 80: Correlated Electrons: Poster

TT 80.34: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster E

NMR of the Ising-type spin chain BaCo₂V₂O₈ at pulsed magnetic fields — D. Opherden¹, Z. Wang², Y. Ihara³, K. Matsui⁴, T. Kotte¹, S. Yamamoto¹, J. Wosnitza¹, S. Luther¹, T. Lorenz⁵, and •H. Kühne¹ — ¹HLD-HZDR, Dresden — ²Department of Physics, TU Dortmund — ³Department of Physics, Hokkaido University — ⁴Institute for Solid State Physics, Tokio — ⁵Institute of Physics II, University of Cologne

NMR measurements at pulsed magnetic fields have been developed at dedicated large-scale research facilities for some time and are becoming increasingly available for user experiments. We will present our new results on the Ising-type spin-chain system BaCo₂V₂O₈, which hosts a quantum critical point at 40 T for magnetic fields applied transverse to the Ising axis. We studied BaCo₂V₂O₈ using ⁵¹V NMR with pulsed magnetic fields up to about 60 T. The resulting NMR spectra probe the local uniform magnetization up to and across the regime of the quantum critical point. In the saturated regime, the field-induced suppression of electronic-moment fluctuations enables the detection of otherwise undetectable ⁵⁹Co NMR spectra, providing complementary insight into the field-driven polarization process of the Co²⁺ moments.

Keywords: NMR; Pulsed magnetic fields; Transverse-field Ising spin chain