Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.58: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
From Kitaev exchange towards quantum disorder: A pressure dependent optical study on α-RuCl3 — •Tobias Biesner1, Weiwu Li1, Yohei Saito1, Andrej Pustogow1, Martin Dressel1, Anja Wolter-Giraud2, Bernd Büchner2, Maria Roslova3, and Thomas Doert3 — 11. Physikalische Institut, Universität Stuttgart, Germany — 2IFW-Dresden, Germany — 3Dept. Chem. and Food Chem., TU-Dresden, Germany
The jeff=1/2 Mott insulator α-RuCl3 is a promising Kitaev quantum spin liquid candidate due to its layered, almost ideal honeycomb lattice with a high degree of frustration. While the pure Kitaev physics is commonly hampered by a magnetic state, external pressure could suppress antiferromagnetic order.
We present a comprehensive study of the optical properties of α-RuCl3 powder and single crystals by infrared spectroscopy in a broad range of frequencies down to low temperatures and under hydrostatic pressures in order to elucidate a pressure-induced new quantum state. Due to the large energy scales of α-RuCl3, moderate pressures (p<1.8 GPa) do not significantly affect the Mott insulating state. However, afm order is suppressed by pressure resulting in a transition to a quantum spin liquid like state and unveiling pure Mott physics. In the optical response we see signatures of enhanced symmetric anisotropic exchange, and evolution of the band structure; providing evidence for a strong coupling of electronic and magnetic correlations. The potential of optical studies for pressure-induced exotic quantum states is shown for α-RuCl3 and discussed for other Kitaev candidates.