%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 }