Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 57: Correlated Magnetism – Kagome Systems
TT 57.5: Vortrag
Mittwoch, 11. März 2026, 16:00–16:15, CHE/0091
Pressure-tuned Kagome spin liquid in Herbertsmithite ZnCu3(OH)6Cl2 — •Victoria Ginga1, Rodolfo A. Rangel Hernandez1, Bin Shen2, Louis Stein3, Ece Uykur3, Philipp Gegenwart2, and Alexander A. Tsirlin1 — 1Felix Bloch Institute, University of Leipzig, Germany — 2EP VI, EKM, University of Augsburg, Germany — 3Helmholtz-Zentrum Dresden-Rossendorf, Germany
Herbertsmithite is a benchmark S = 1/2 Kagome quantum spin-liquid candidate. At ambient pressure, our magnetization data confirm the absence of long-range order down to 2 K while revealing a low-field spin-freezing that is suppressed by moderate fields. High-pressure single-crystal diffraction shows that the trigonal structure remains stable up to 22 GPa, beyond which the material becomes amorphous. Whereas an earlier study [1] reported non-monotonic changes in Cu-O distances and Cu-O-Cu angles near 2.5 GPa concomitant with pressure-induced TN around 6 K, our high-pressure structural data show no such behavior. Our pressure-dependent magnetization up to 4.2 GPa shows no transition, while spin freezing persists with an almost constant freezing temperature of 7 K. Using experimentally determined high-pressure structures, we quantify exchange couplings via DFT and map how the dominant interactions evolve with bond geometry. Our findings show that, to at least 4.2 GPa, Herbertsmithite preserves its quantum-disordered ground state and provides a reference framework for pressure tuning in Kagome spin-liquid candidates.
[1] Phys. Rev. Lett. 108, 187207
Keywords: pressure tuning; herbertsmithite; spin liquid; kagome; quantum magnetism