Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Poster Session: Correlated Electrons 2
TT 50.19: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Phase diagram of the natural mineral green dioptase Cu6[Si6O18]·6H2O — •Erik Schulze1,2, Alexey N. Ponomaryov1, Denis I. Gorbunov1, Toshihiro Nomura1, Sergei Zherlitsyn1, Jochen Wosnitza1,2, Andrey Podlesnyak3, and Sergei A. Zvyagin1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Dresden, Germany — 3Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
We present combined high-field ultrasound, magnetization, and electron spin resonance studies of the natural mineral green dioptase (Cu6[Si6O18]·6H2O). This material orders antiferromagnetically below TN=14.5 K, forming a spiral chain structure with a propagation vector along the c axis. Although a ferromagnetic interaction in the ab plane couples the system into a three-dimensional framework, the material shows clear signatures of large quantum fluctuations, suggesting the low-dimensional nature of the spin correlations. The obtained phase diagram, studied in magnetic fields up to 80 T, reveals several magnetic phases, whose peculiarities are discussed.
This work was supported by Deutsche Forschungsgemeinschaft (project ZV 6/2-2).