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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)3Leonie 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 Süllow11TU 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).

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