SKM 2023 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 47: Quantum-Critical Phenomena

TT 47.3: Talk

Thursday, March 30, 2023, 10:00–10:15, HSZ 204

Search for ferromagnetic quantum phase transitions in CePt — Marc Seifert¹, •Florian Kübelbäck¹, Pau Jorba¹, Michael Schulz², Georg Benka¹, Andreas Bauer¹, and Christian Pfleiderer¹ — ¹Physik-Department, Technical University of Munich, D-85748 Garching, Germany — ²MLZ, Technical University of Munich, D-85748 Garching, Germany

We report an investigation of the ferromagnetic properties and the putative existence of quantum phase transitions in CePt. Tracking the neutron depolarization of polycrystalline samples under pressure by means of bespoke diamond anvil cell and focussing neutron guides [1], we confirm the presence of a ferromagnetic to paramagnetic quantum phase transition at 13 GPa as inferred previously from the resistivity [2]. An additional drop in the depolarization deep in the ferromagnetic state for pressures up to 5 GPa suggests an additional small moment to large moment transition. We explore the nature and possible existence of a second quantum phase transition in the ferromagnetic state of single-crystal CePt grown under ultra-high vacuum compatible conditions. The pressure versus temperature phase diagram of CePt and its magnetic properties will be compared with the emergence of a Kondo cluster glass in the isostructural sibling CePd of CePt when suppressing ferromagnetic order by substitutional Rh doping [3].

[1] P. Jorba et al., Phys. Stat. Solidi b, 2100623 (2022)

[2] J. Larrea et al., Phys. Rev. B, 72, 035129 (2005)

[3] M. Seifert et al., Phys. Rev. Res. 4, 043029 (2022)