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TT: Fachverband Tiefe Temperaturen
TT 81: Frustrated Magnets: General II
TT 81.4: Talk
Thursday, March 21, 2024, 17:15–17:30, H 2053
Quantum criticality in the sawtooth chain compound atacamite — •Leonie Heinze1,2, Tommy Kotte3, Albin Demuer4, Sven Luther3, Ralf Feyerherm5, Andrew Ammerlaan6, Uli Zeitler6, Dirk Menzel1, Kirrily C. Rule7, Anja U. B. Wolter8, Hannes Kühne3, and Stefan Süllow1 — 1IPKM, TU Braunschweig, Braunschweig, Germany — 2FZ Jülich GmbH, JCNS at MLZ, Garching, Germany — 3HLD-EMFL, HZDR, Dresden-Rossendorf, Germany — 4LNCMI, CNRS, Grenoble, France — 5HZB, Berlin, Germany — 6HFML-EMFL, Nijmegen, The Netherlands — 7ANSTO, Kirrawee, Australia — 8IFW Dresden, Dresden, Germany
We present an extensive high-field heat capacity study of the natural mineral atacamite, a material realization of the non-uniform quantum sawtooth chain in a very weak 3D coupling network [1]. For applied magnetic fields up to 35 T, we have mapped out the highly distorted entropy landscape of this frustrated material for H ∥ c axis. We found evidence for a field-induced quantum critical point in the phase diagram of atacamite, which appears to separate the field region of the antiferromagnetic phase present in lower magnetic fields and a field region without long-range magnetic order in higher magnetic fields—but far away from the saturation field.
[1] L. Heinze et al., Phys. Rev. Lett. 126 (2021) 207201
Keywords: frustration; sawtooth chain; mineral; quantum criticality; high magnetic fields