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TT: Fachverband Tiefe Temperaturen

TT 80: Correlated Electrons: Poster

TT 80.34: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster E

NMR of the Ising-type spin chain BaCo2V2O8 at pulsed magnetic fieldsD. Opherden1, Z. Wang2, Y. Ihara3, K. Matsui4, T. Kotte1, S. Yamamoto1, J. Wosnitza1, S. Luther1, T. Lorenz5, and •H. Kühne11HLD-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

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