Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.41: Poster

Wednesday, March 18, 2015, 15:00–18:00, Poster B

Hydrostatic pressure experiments on frustrated hexagonal Iridates — •Rudra Sekhar Manna, Friedrich Freund, and Philipp Gegenwart — EP VI, Center for Electronic Correlations and Magnetism, Augsburg University, 86159 Augsburg, Germany

Hexagonal iridates A₂IrO₃ (A = Na, Li) have novel electronic and magnetic properties due to the strong spin-orbit coupling and electronic correlations. They are proposed candidate materials for the realization of the frustrated bonding-dependent anisotropic Kitaev interaction [1, 2]. While the structure of Na₂IrO₃ and α-Li₂IrO₃ consists of a two-dimensional (2D) honeycomb lattice, a 3D, so-called hyper-honeycomb structure is realized in β-Li₂IrO₃ [3, 4]. All different materials display long-range magnetic order, in contrast to a Kitaev quantum spin-liquid, although the analysis of the magnetic properties indicates dominating Kitaev exchange interactions [3]. The Kitaev interaction sensitively depends on the Ir-O-Ir bonding angle which may be varied by external pressure. This motivates a detailed study of the hydrostatic pressure dependence of the magnetic properties of hexagonal iridates. In particular we investigate the bulk magnetization in a commercial SQUID magnetometer up to 2 GPa using Daphne oil as pressure medium and a small piece of lead as pressure sensor.

[1] Y. Singh et al., PRL 108, 127203 (2012).

[2] S. Manni et al., PRB 89, 245113 (2014).

[3] A. Biffin et al., PRB 90, 205116 (2014).

[4] T. Takayama et al., arXiv:1403.3296 (2014).