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Thermodynamic Evidence of Proximity to a Kitaev Spin Liquid in Ag3LiIr2O6

Abstract : Kitaev magnets are materials with bond-dependent Ising interactions between localized spins on a honeycomb lattice. Such interactions could lead to a quantum spin-liquid (QSL) ground state at zero temperature. Recent theoretical studies suggest two potential signatures of a QSL at finite temperatures, namely, a scaling behavior of thermodynamic quantities in the presence of quenched disorder, and a two-step release of the magnetic entropy. Here, we present both signatures in Ag3LiIr2O6 which is synthesized from alpha-Li2IrO3 by replacing the interlayer Li atoms with Ag atoms. In addition, the dc susceptibility data confirm the absence of a long-range order, and the ac susceptibility data rule out a spin-glass transition. These observations suggest a closer proximity to the QSL in Ag3LiIr2O6 compared to its parent compound alpha-Li2IrO3 that orders at 15 K. We discuss an enhanced spin-orbit coupling due to a mixing between silver d and oxygen p orbitals as a potential underlying mechanism.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-02438556
Contributor : Laurent Jonchère <>
Submitted on : Tuesday, January 14, 2020 - 11:49:47 AM
Last modification on : Wednesday, July 15, 2020 - 2:00:16 PM

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Faranak Bahrami, William Lafargue-Dit-Hauret, Oleg I. Lebedev, Roman Movshovich, Hung-Yu Yang, et al.. Thermodynamic Evidence of Proximity to a Kitaev Spin Liquid in Ag3LiIr2O6. Physical Review Letters, American Physical Society, 2019, 123 (23), ⟨10.1103/PhysRevLett.123.237203⟩. ⟨hal-02438556⟩

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