Berlin 2015 – wissenschaftliches Programm
TT 71.41: Poster
Mittwoch, 18. März 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 . 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.
 Y. Singh et al., PRL 108, 127203 (2012).
 S. Manni et al., PRB 89, 245113 (2014).
 A. Biffin et al., PRB 90, 205116 (2014).
 T. Takayama et al., arXiv:1403.3296 (2014).