Mott insulators with strong spin-orbit coupling display a strongly anisotropic response to applied magnetic fields. This applies in particular to Kitaev materials, with α−$RuCl_3$ and $Na_2IrO_3$ representing two important examples. Both show a magnetically ordered zigzag state at low temperatures, and considerable effort has been devoted to properly modeling these systems in order to identify routes towards realizing a quantum spin liquid. Here, we investigate the relevant Heisenberg-Kitaev-Γ model primarily at elevated temperatures, focusing on the characteristic anisotropy between the in-plane and out-of-plane uniform susceptibility. For α−$RuCl_3$, we find that the experimentally observed anisotropy, including its temperature dependence, can be reproduced by combining a large off-diagonal Γ_1 coupling with a moderate g-factor anisotropy. Moreover, we study in detail the effect of magnetic dilution and provide predictions for the doping evolution of the temperature-dependent susceptibilities.
Beschreibung
Phys. Rev. B 102, 115160 (2020) - Susceptibility anisotropy and its disorder evolution in models for Kitaev materials
%0 Journal Article
%1 PhysRevB.102.115160
%A Andrade, Eric C.
%A Janssen, Lukas
%A Vojta, Matthias
%D 2020
%I American Physical Society
%J Phys. Rev. B
%K b
%N 11
%P 115160
%R 10.1103/PhysRevB.102.115160
%T Susceptibility anisotropy and its disorder evolution in models for Kitaev materials
%U https://link.aps.org/doi/10.1103/PhysRevB.102.115160
%V 102
%X Mott insulators with strong spin-orbit coupling display a strongly anisotropic response to applied magnetic fields. This applies in particular to Kitaev materials, with α−$RuCl_3$ and $Na_2IrO_3$ representing two important examples. Both show a magnetically ordered zigzag state at low temperatures, and considerable effort has been devoted to properly modeling these systems in order to identify routes towards realizing a quantum spin liquid. Here, we investigate the relevant Heisenberg-Kitaev-Γ model primarily at elevated temperatures, focusing on the characteristic anisotropy between the in-plane and out-of-plane uniform susceptibility. For α−$RuCl_3$, we find that the experimentally observed anisotropy, including its temperature dependence, can be reproduced by combining a large off-diagonal Γ_1 coupling with a moderate g-factor anisotropy. Moreover, we study in detail the effect of magnetic dilution and provide predictions for the doping evolution of the temperature-dependent susceptibilities.
@article{PhysRevB.102.115160,
abstract = {Mott insulators with strong spin-orbit coupling display a strongly anisotropic response to applied magnetic fields. This applies in particular to Kitaev materials, with α−$RuCl_3$ and $Na_2IrO_3$ representing two important examples. Both show a magnetically ordered zigzag state at low temperatures, and considerable effort has been devoted to properly modeling these systems in order to identify routes towards realizing a quantum spin liquid. Here, we investigate the relevant Heisenberg-Kitaev-Γ model primarily at elevated temperatures, focusing on the characteristic anisotropy between the in-plane and out-of-plane uniform susceptibility. For α−$RuCl_3$, we find that the experimentally observed anisotropy, including its temperature dependence, can be reproduced by combining a large off-diagonal Γ_1 coupling with a moderate g-factor anisotropy. Moreover, we study in detail the effect of magnetic dilution and provide predictions for the doping evolution of the temperature-dependent susceptibilities.},
added-at = {2021-03-02T10:17:52.000+0100},
author = {Andrade, Eric C. and Janssen, Lukas and Vojta, Matthias},
biburl = {https://www.bibsonomy.org/bibtex/29eed514d3ef1d69328b397dfd1893139/ctqmat},
day = 28,
description = {Phys. Rev. B 102, 115160 (2020) - Susceptibility anisotropy and its disorder evolution in models for Kitaev materials},
doi = {10.1103/PhysRevB.102.115160},
interhash = {d5b82ade5ccc93b207db04237a6005de},
intrahash = {9eed514d3ef1d69328b397dfd1893139},
journal = {Phys. Rev. B},
keywords = {b},
month = {09},
number = 11,
numpages = {12},
pages = 115160,
publisher = {American Physical Society},
timestamp = {2023-01-16T14:49:29.000+0100},
title = {Susceptibility anisotropy and its disorder evolution in models for Kitaev materials},
url = {https://link.aps.org/doi/10.1103/PhysRevB.102.115160},
volume = 102,
year = 2020
}