Susceptibility anisotropy and its disorder evolution in models for Kitaev materials. ANDRADE, Eric de Castro e; JANSSEN, Lukas; VOJTA, Matthias.
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 a-RuCl3 and Na2IrO3 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-G model primarily at elevated temperatures, focusing on the characteristic anisotropy between the in-plane and out-of-plane uniform susceptibility. For a-RuCl3, we find that the experimentally observed anisotropy, including its temperature dependence, can be reproduced by combining a large off-diagonal G1 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.
Physical Review B
v. 102, n. 11, p. 115160-1-115160-12 - Ano: 2020
Fator de Impacto: 3,575
@article={003006816,author = {ANDRADE, Eric de Castro e; JANSSEN, Lukas; VOJTA, Matthias.},title={Susceptibility anisotropy and its disorder evolution in models for Kitaev materials},journal={Physical Review B},note={v. 102, n. 11, p. 115160-1-115160-12},year={2020}}
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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 a-RuCl3 and Na2IrO3 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-G model primarily at elevated temperatures, focusing on the characteristic anisotropy between the in-plane and out-of-plane uniform susceptibility. For a-RuCl3, we find that the experimentally observed anisotropy, including its temperature dependence, can be reproduced by combining a large off-diagonal G1 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={003006816,author = {ANDRADE, Eric de Castro e; JANSSEN, Lukas; VOJTA, Matthias.},title={Susceptibility anisotropy and its disorder evolution in models for Kitaev materials},journal={Physical Review B},note={v. 102, n. 11, p. 115160-1-115160-12},year={2020}}