SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 29: Frustrated Magnets: General
TT 29.2: Vortrag
Mittwoch, 29. März 2023, 09:45–10:00, HSZ 201
Thermodynamic study of the partially polarized state of the sawtooth chain atacamite, Cu2Cl(OH)3 — Leonie Heinze1, Tommy Kotte2, Albin de Muer3, Sven Luther2,4, Andrew Ammerlaan5, Uli Zeitler5, Anja U.B. Wolter6, Bernd Büchner6, Kirrily C. Rule7, Hannes Kühne2, and •Stefan Süllow1 — 1TU Braunschweig, Braunschweig, Germany — 2HLD, HZ Dresden-Rossendorf, Germany — 3LNCMI, CNRS, Grenoble, France — 4TU Dresden, Dresden, Germany — 5HFML, Radboud University, Nijmegen, The Netherlands — 6ANSTO, Lucas Heights, Australia — 7IFW Dresden, Dresden, Germany
Recently, the natural mineral atacamite, Cu2Cl(OH)3, has been established as a unique model compound of the S = 1/2 quantum sawtooth chain with a dominant magnetic exchange J ∼ 360 K along the chain spine and J′ ∼ 102 K within the sawteeth [1]. Residual interchain couplings of a few Kelvin drive atacamite into an antiferromagnetic (AFM) ground state below TN = 8.4 K. The AFM phase is suppressed in magnetic fields of ∼ 30 T. Upon suppression of AFM order, the magnetization becomes plateau-like close to Msat/2.
By now, we have been able to study the magnetic phase diagram up into the unusual partially polarized state by means of specific heat. Here, we present a corresponding study and present evidence for quantum critical behavior occuring upon suppression of AFM order.
[1] L. Heinze et al., Phys. Rev. Lett. 126, 207201 (2021).