Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 47: Frustrated Magnets - Iridates and Fe-based Materials

TT 47.4: Vortrag

Mittwoch, 14. März 2018, 10:15–10:30, H 0104

Tuning the Magnetism in Honeycomb Magnets — •Sebastian Selter¹, Esther Jarossay^1,2, Anja U. B. Wolter¹, Saicharan Aswartham¹, and Bernd Buechner^1,2 — ¹IFW Dresden, Dresden, Germany — ²TU Dresden, Dresden, Germany

We present a magnetic phase diagram of Na₂(Ir_1−xPt_x)O₃, where the magnetic order is systematically suppressed by Pt substitution. Further, preliminary data on crystal growth and magnetic behavior of Na₂Co₂TeO₆ and Na₃Co₂SbO₆ will be discussed.

Na₂IrO₃ possess a frustrated honeycomb lattice, similar to RuCl₃ (Ir, Ru: d⁵) and Na₂Co₂TeO₆ and Na₃Co₂SbO₆ (Co: d⁷). These compounds are proposed to be the best suited candidates to host a Quantum spin liquid (QSL) state. However, all these compounds show a zig-zag antiferromagnetic order at low temperatures, still indicating strong bond dependent Kitaev-type interactions. Recent experiments have shown that this magnetic order is extremely fragile. In Na₂IrO₃ already 5% of Ru substitution on the Ir site is sufficient to suppress the magnetic order, while RuCl₃ shows a field induced QSL state.

We address the question, how the magnetic ground state of Na₂IrO₃ is affected by dilution of the magnetic Ir honeycomb lattice with nonmagnetic Pt.