Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 64: Frustrated Magnets - α-RuCl₃ and Cu-based Materials

TT 64.8: Vortrag

Mittwoch, 14. März 2018, 17:00–17:15, HFT-FT 101

High magnetic field study of the frustrated quantum magnet atacamite — •Stefan Süllow¹, Leonie Heinze¹, Marcelo Jaime², Xiaxin Ding², Vivian Zapf², Anja U.B. Wolter³, and Kirrily C. Rule⁴ — ¹TU Braunschweig, Braunschweig, Germany — ²NHMFL, Los Alamos, USA — ³IFW Dresden, Dresden, Germany — ⁴The Bragg Institute, ANSTO, Australia

The mineral atacamite Cu₂Cl(OH)₃ has been proposed to represent a frustrated quantum magnet [1,2]. From a basic magnetic characterization in low magnetic fields, it can be inferred that long range magnetic order occurs below T_N = 9 K and ∼ 10 T (ordering vector q = [1/2 0 1/2]), while magnetic saturation is attained only for fields beyond 50 T. This difference in field scales likely reflects low dimensionality and/or geometric frustration of the magnetic system. Therefore, we have carried out a magnetostrictive high magnetic field study, this way establishing the essential features of the magnetic phase diagram for all crystallographic axes in fields up to 65 T. We find rich phase diagrams for all directions and discuss these in terms of possible magnetic models accounting for the properties of atacamite.
X. G. Zheng, et al., Phys. Rev. B 71, 174404 (2005).
L. Heinze, et al., Physica B (2017),
http://dx.doi.org/10.1016/j.physb.2017.09.073.