Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 56: Correlated Electrons: Quantum-Critical Phenomena
TT 56.3: Vortrag
Donnerstag, 19. März 2020, 10:00–10:15, HSZ 304
Low temperature transverse susceptibility of LiHoF4 — •Andreas Wendl, Felix Rucker, Christopher Duvinage, and Christian Pfleiderer — Physik Department TU München, James-Franck Straße 1, 85748 Garching
LiHoF4 exhibits the experimental realisation of the simplest quantum spin model of a ferromagnetic quantum phase transition: the transverse field Ising model [1]. Application of a magnetic field perpendicular to the easy magnetic axis, suppresses long-range ferromagnetic order above a critical field, Bc≈5.1 T. We report measurements of the transverse ac susceptibility of a spherical single-crystal of LiHoF4. For our study we used a bespoke miniature ac susceptometer optimised for measurements at milli-Kelvin temperatures under arbitrary directions of the applied magnetic field using a vector magnet. This allowed us to determine the phase diagram under tilted magnetic fields as well as the precise magnetic field dependence of the Curie temperature at low fields under strictly transverse field geometry. In addition, we tracked the thermal and quantum freezing of ferromagnetic domains.
[1] D. Bitko et al., Phys. Rev. Lett. 77, 940 (1996)
[2] F. Rucker and C. Pfleiderer, Rev. Sci. Instrum. 90, 073903 (2019).