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 53.5: Vortrag
Donnerstag, 4. April 2019, 10:30–10:45, Theater
Microscopic study of the Kitaev material β-Li2IrO3 under pressure and magnetic field — •Mayukh Majumder1, Markus Pritz-Zwick2, Tushar Kanti Dey1, Rudra Sekhar Manna1, Gediminas Simutis3, Jean-Christophe Orain3, Friedrich Freund1, Rustem Khasanov3, Pabitra Kumar Biswas4, Norbert Büttgen2, Aleaxander Tsirlin1, and Philipp Gegenwart1 — 1EP VI, University of Augsburg — 2EP V, University of Augsburg — 3PSI, Switzerland — 4ISIS Pulsed Neutron and Muon Source, UK
β-Li2IrO3 with Ir4+ moments on a three-dimensional hyperhoneycomb lattice belongs to the class of much-discussed Kitaev materials [1]. At zero-field and ambient pressure, it displays a phase transition at 38 K to an incommensurate non-coplanar and counter-rotating spiral magnetic state [2]. Application of magnetic fields exceeding 2.8 T along the easy b-axis transforms the ground state into a partially polarized quantum paramagnet, which we characterize by thermodynamic as well as 7Li NMR experiments. Furthermore, long-range order (at zero-field) can also be suppressed by the application of hydrostatic pressure. We also discuss our comparative study of bulk and µSR experiments under pressure, which reveal a first-order transition at 1.4 GPa giving way to a new ground state with the coexistence of dynamically correlated and frozen spins [3]. No accompanying structural transition was found and further characterization by 7Li NMR experiments under pressure is intended.
Work supported by DFG through TRR 80.
Phys. Rev. Lett. 114, 077202 (2015)
Phys. Rev. B 90, 205116 (2014)
Phys. Rev. Lett. 120 237202 (2018)