Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 62: Correlated Electrons – Poster II
TT 62.7: Poster
Wednesday, March 11, 2026, 15:00–17:00, P4
Pressure evolution of magnetic and electronic states in CeAgSb2 — •Riley Mann, Oliver Busby, Christian de Podesta, Oliver Squires, and Malte Grosche — Cavendish Laboratory, University of Cambridge, Cambridge CB3 0US, United Kingdom
CeAgSb2 is a Kondo lattice material which hosts a weak ferromagnetic ground state at ambient pressure. Through the application of pressure, ferromagnetism can be suppressed, suggesting a quantum critical point at a critical pressure pc∼34kbar. Previous measurements have shown the emergence of new phases near this quantum critical region, two of which have been interpreted as antiferromagnetic, whereas the nature of the third phase remains unclear. Our quantum oscillation measurements at ambient pressure indicate strong quasiparticle mass enhancement, with effective masses up to 34 me.
We present preliminary high-pressure measurements in the vicinity of the quantum critical region and extending up to about 70 kbar. Resistivity, magnetic susceptibility, and radio-frequency tunnel diode oscillator measurements were performed in high pressure anvil cells to track phase transition signatures, clarify the structure of the high pressure phase diagram, and investigate non-Fermi liquid signatures in transport properties. Measurements at T<1K near pc give insight into the order of the ferromagnetic transition near the critical point and into the nature of the unknown phase.
Keywords: High-Pressure techniques; Quantum criticality; Kondo Lattice; non-Fermi liquid; Magnetic states