Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Poster Session: Correlated Electrons 2
TT 50.22: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Unveiling the QSL ground state: An optical study on Cu5V2O10(CsCl) — •Tobias Biesner1, Andrej Pustogow1,2, Hong Zheng3, John F. Mitchell3, and Martin Dressel1 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2UCLA Physics and Astronomy, USA — 3Materials Science Division, Argonne National Laboratory, USA
The copper oxide Averievite Cu5V2O10(CsCl) hosts highly frustrated S=1/2 kagome planes connected in 3D by a honeycomb sublattice. Due to the large intra- and interlayer coupling of the magnetic copper ions, the material possesses an antiferromagnetic ground state (TN=24 K). By replacing Cu ions within the honeycomb lattice by Zn, the kagome planes decouple and the long-range magnetic order is suppressed, glancing at the celebrated quantum spin liquid.
We present a comprehensive optical study on Cu5−xZnxV2O10(CsCl) for various Zn substitutions x ≤ 1.25 in a broad range of frequencies from the THz region to the visible range and down to T=10 K. Comparing our experimental results with the recent band structure calculations, we elaborate the rich electronic structure and the possible low-energy excitations.