Find Paper, Faster
Example:10.1021/acsami.1c06204 or Chem. Rev., 2007, 107, 2411-2502
Interplay of magnetism and dimerization in the pressurized Kitaev materialβ−Li2IrO3
Physical Review B  (IF4.036),  Pub Date : 2021-10-22, DOI: 10.1103/physrevb.104.134426
Bin Shen, Anton Jesche, Maximilian L. Seidler, Friedrich Freund, Philipp Gegenwart, Alexander A. Tsirlin

We present magnetization measurements on polycrystalline βLi2IrO3 under hydrostatic pressures up to 3 GPa and construct the temperature-pressure phase diagram of this material. Our data confirm that magnetic order breaks down in a first-order phase transition at pc1.4 GPa and additionally reveal a steplike feature—magnetic signature of structural dimerization—that appears at pc and shifts to higher temperatures upon further compression. Following the structural study by L. S. I. Veiga et al. [Phys. Rev. B 100, 064104 (2019)], we suggest that a partially dimerized phase with a mixture of magnetic and nonmagnetic Ir4+ sites develops above pc. This phase is thermodynamically stable between 1.7 and 2.7 GPa according to our ab initio calculations. It confines the magnetic Ir4+ sites to weakly coupled tetramers with a singlet ground state and no long-range magnetic order. Our results rule out the formation of a pressure-induced spin-liquid phase in βLi2IrO3 and reveal peculiarities of the magnetism collapse transition in a Kitaev material. We also show that a compressive strain imposed by the pressure treatment of βLi2IrO3 enhances signatures of the 100 K magnetic anomaly at ambient pressure.