Thermodynamic Evidence of Proximity to a Kitaev Spin Liquid in Ag3LiIr2O6

被引：65

作者：

Bahrami, Faranak ^{[1
]}

Lafargue-Dit-Hauret, William ^{[2
,3
]}

Lebedev, Oleg I. ^{[4
]}

Movshovich, Roman ^{[5
]}

Yang, Hung-Yu ^{[1
]}

Broido, David ^{[1
]}

Rocquefelte, Xavier ^{[2
]}

Tafti, Fazel ^{[1
]}

机构：

[1] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[2] Univ Rennes, ISCR, CNRS, UMR 6226, F-35000 Rennes, France

[3] Univ Liege, CESAM, Phys Theor Mat, B-4000 Sart Tilman Par Liege, Belgium

[4] ENSICAEN, CNRS, UMR6508, Lab CRISMAT, F-14050 Caen, France

[5] Los Alamos Natl Lab, MPA CMMS, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 23期

基金：

美国国家科学基金会;

关键词：

HONEYCOMB; DELAFOSSITES; CRYSTAL;

D O I：

10.1103/PhysRevLett.123.237203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：6

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