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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 53: Frustrated Magnets - Strong Spin-Orbit Coupling (joint session TT/MA)

TT 53.1: Vortrag

Donnerstag, 4. April 2019, 09:30–09:45, Theater

Dimerization of the honeycomb iridate α-Li2IrO3 under pressure — •Jihaan Ebad-Allah1,2, V. Hermann1, M. Altmeyer3, F. Freund1, A. Jesche1, A. A. Tsirlin1, M. Hanfland4, P. Gegenwart1, I. I. Mazin5, D. I. Khomskii6, R. Valenti3, and C. A. Kuntscher11Universitat Augsburg, 86159 Augsburg, Germany — 2University of Tanta, 31527 Tanta, Egypt — 3Goethe- Universitat Frankfurt, 60438 Frankfurt am Main, Germany — 4European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France — 5Code 6393, Naval Research Laboratory, Washington DC 20375, USA — 6Universitat zu Koln, 50937 Koln, Germany

The honeycomb iridates A2IrO3 (A= Na, Li) show novel behavior and phases arising from the competition between spin-orbit coupling, magnetization, and dimerization. Here, we show the results of x-ray diffraction and optical spectroscopy measurements under pressure on α-Li2IrO3 and Na2IrO3 single crystals. In α-Li2IrO3, a pressure-induced dimerization of Ir-Ir bonds is observed at Pc=3.8 GPa, concomitant with anomalies in the optical response, while in Na2IrO3 this transition is expected at a much higher pressure [1]. The results are discussed in terms of the effect of Ir-Ir bonds on the magnetic and electronic properties and compared to other honeycomb materials.
V. Hermann et al., Phys. Rev. B 97, 020104(R) (2018)

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