Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 80: Correlated Electrons: Poster
TT 80.28: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster E
Significant suppression of the lattice softening close to the QCP in CoNb2O6 — •Andreas Hauspurg1,2, S. Zherlitsyn1, K. Matsuura3, T.-H. Arima4, and J. Wosnitza1,2 — 1Hochfeld-Magnetlabor Dresden, HZDR, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3RIKEN Center for Emergent Matter Science, Japan — 4Department of Advanced Materials Science, University of Tokyo, Japan
CoNb2O6 is a model system for the spin-1/2 one-dimensional transverse field Ising model and shows a quantum critical point (QCP) at 4.75 T for H ∥ b. Neutron-diffraction experiments have revealed a set of discrete collective spin modes in CoNb2O6, which follow the long-sought E8 symmetry at the QCP. This proposition is supported by investigations with THz spectroscopy and NMR, which suggest that a one-dimensional QCP might lie within the 3D ordered phase [1,2,3].
We studied CoNb2O6 by means of the ultrasound pulsed-echo technique and investigated the in field magnetoelastic properties down to lowest temperatures of 0.3 K. In our contribution we present and discuss a significant suppression of the elastic softening related to the QCP. We studied this behavior to much lower temperatures than done before [4].
[1] Coldea et al., Science 327, 177 (2010).
[2] Amelin et al., Phys. Rev. B 102, 104431 (2020).
[3] Kinross et al., Phys. Rev. X 4, 031008 (2014).
[4] Matsuura et al., Phys. Rev. Lett. 124, 127205 (2020).
Keywords: Quantum Critical Point; Transverse-field Ising Magnet; Magnetoelastic coupling