SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 42: Poster: Correlated Electrons I

TT 42.6: Poster

Mittwoch, 29. März 2023, 15:00–18:00, P2/OG2

Transverse-field susceptibility of spin freezing at the mesoscale quantum phase transitions in LiHoF4 — •Michael Lampl, Andreas Wendl, Felix Rucker, and Christian Pfleiderer — Physik-Department, Technical University of Munich, 85748 Garching, Germany

The perhaps best understood example of a quantum critical point is the response of the dipolar Ising ferromagnet LiHoF4 under a transverse field [1-3]. When tilting the magnetic field away from the hard axis such that the Ising symmetry is always broken, a line of well-defined phase transitions emerges from the transverse-field quantum critical point, characteristic of further symmetry breaking, and in stark contrast to a crossover expected microscopically [4]. Detailed theoretical modelling in excellent agreement with experiment identifies this line of phase transitions as mesoscale quantum criticality. We report an experimental study of the transverse-field susceptibility of this mesoscale quantum criticality into a regime of spin freezing under large field tilting angles. Our observations will be compared with the characteristics of spin freezing, kinetic arrest, and quantum annealing observed in heavily diluted LiHoxY1−xF4.
[1] D. Bitko et al., Phys. Rev. Lett. 77, 940 (1996)
[2] H. M. Ronnow et al., Science 308, 389 (2005)
[3] P. B. Chakraborty et al., Phys. Rev. B 70, 144411 (2004)
[4] A. Wendl et al., Nature 609, 65 (2022)

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