Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Frustrated Magnets - General 1 (joint session TT/MA)

TT 23.2: Vortrag

Dienstag, 2. April 2019, 09:45–10:00, Theater

Magnetization plateau in the frustrated quantum sawtooth chain atacamite, Cu₂Cl(OH)₃ — •Leonie Heinze¹, Xiaxin Ding², Vivien Zapf², Franziska Weickert², Marcelo Jaime², Gaël Bastien³, Anja U.B. Wolter³, Manfred Reehuis⁴, Jens-Uwe Hoffmann⁴, Ralf Feyerherm⁴, Dirk Menzel¹, Kirrily C. Rule⁵, and Stefan Süllow¹ — ¹IPKM, TU Braunschweig, Braunschweig, Germany — ²NHMFL, Los Alamos, USA — ³IFW Dresden, Dresden, Germany — ⁴HZB, Berlin, Germany — ⁵ANSTO, Kirrawee, Australia

The frustrated nature of the quantum magnet atacamite, Cu₂Cl(OH)₃, is displayed by its magnetic properties [1]. Band structure calculations [2] suggest that the magnetic coupling scheme can essentially be understood in terms of a quantum sawtooth chain with a dominant coupling along the chain of about J₁ ∼ 100 K, and a secondary coupling about J₂ ∼ 30 K.

Here, we present new insights into the magnetic phase diagram of atacamite. We discuss the long-range ordered magnetic ground state below T_N = 8.6 K and present high field magnetization data revealing a 1/2-magnetization plateau. Magnetic saturation is estimated to be attained in fields between 75 to 80 T.
L. Heinze, et al., Physica B 536, 377 (2018)
H. O. Jeschke and R. Valentí, private communication.