Comment on 'Oxygen vacancy-induced magnetic moment in edge-sharing CuO2 chains of Li2CuO2'

R. O. Kuzian; R. Klingeler; W. E.A. Lorenz; N. Wizent; S. Nishimoto; U. Nitzsche; H. Rosner; D. Milosavljevic; L. Hozoi; R. Yadav; J. Richter; A. Hauser; J. Geck; R. Hayn; V. Yushankhai; L. Siurakshina; C. Monney; T. Schmitt; J. Thar; G. Roth; T. Ito; H. Yamaguchi; M. Matsuda; S. Johnston; J. Málek; S. L. Drechsler

doi:10.1088/1367-2630/aac159

Comment on 'Oxygen vacancy-induced magnetic moment in edge-sharing CuO₂ chains of Li₂CuO₂'

R. O. Kuzian, R. Klingeler, W. E.A. Lorenz, N. Wizent, S. Nishimoto, U. Nitzsche, H. Rosner, D. Milosavljevic, L. Hozoi, R. Yadav, J. Richter, A. Hauser, J. Geck, R. Hayn, V. Yushankhai, L. Siurakshina, C. Monney, T. Schmitt, J. Thar, G. RothT. Ito, H. Yamaguchi, M. Matsuda, S. Johnston, J. Málek, S. L. Drechsler

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Abstract

In a recent work devoted to the magnetism of Li₂CuO₂, Shu et al (2017 New J. Phys. 19, 023026) have proposed a 'simplified' unfrustrated microscopic model that differs considerably from the models refined through decades of prior work. We show that the proposed model is at odds with known experimental data, including the reported magnetic susceptibility χ(T) data up to 550 K. Using an 8th order high-temperature expansion for χ(T), we show that the experimental data for Li₂CuO₂ are consistent with the prior model derived from inelastic neutron scattering studies. We also establish the T-range of validity for a Curie-Weiss law for the real frustrated magnetic system. We argue that the knowledge of the long-range ordered magnetic structure for T < T _N and of χ(T) in a restricted T-range provides insufficient information to extract all of the relevant couplings in frustrated magnets; the saturation field and INS data must also be used to determine several exchange couplings, including the weak but decisive frustrating antiferromagnetic interchain couplings.

Original language	English
Article number	058001
Journal	New Journal of Physics
Volume	20
Issue number	5
DOIs	https://doi.org/10.1088/1367-2630/aac159
State	Published - May 2018

Funding

ROK thanks the Heidelberg University for hospitality. Also the project III-8-16 of the NASc of the Ukraine and the NATO project SfP 984735 are acknowledged. SN thanks the SFB 1143 of the DFG for financial support. MM acknowledges the support by the Scientific User Facilities Division, Office of Basic Energy Sciences, US DOE. We appreciate discussions with A. Tsirlin, B Büchner, V Grinenko, and K Wörner. The publication of this article was funded by the Open Access Fund of the Leibniz Association. ROKthanks the Heidelberg University for hospitality. Also the project III-8-16 of the NASc of the Ukraine and theNATOproject SfP 984735 are acknowledged. SN thanks the SFB 1143 of the DFG for financial support.MM acknowledges the support by the Scientific User Facilities Division, Office of Basic Energy Sciences, US DOE.

Keywords

edge-sharing cuprates
exchange couplings
frustrated magnetism
high-temperature expansion
magnetic susceptibility

Access to Document

10.1088/1367-2630/aac159

Cite this

Kuzian, R. O., Klingeler, R., Lorenz, W. E. A., Wizent, N., Nishimoto, S., Nitzsche, U., Rosner, H., Milosavljevic, D., Hozoi, L., Yadav, R., Richter, J., Hauser, A., Geck, J., Hayn, R., Yushankhai, V., Siurakshina, L., Monney, C., Schmitt, T., Thar, J., ... Drechsler, S. L. (2018). Comment on 'Oxygen vacancy-induced magnetic moment in edge-sharing CuO₂ chains of Li₂CuO₂'. New Journal of Physics, 20(5), Article 058001. https://doi.org/10.1088/1367-2630/aac159

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title = "Comment on 'Oxygen vacancy-induced magnetic moment in edge-sharing CuO2 chains of Li2CuO2'",

abstract = "In a recent work devoted to the magnetism of Li2CuO2, Shu et al (2017 New J. Phys. 19, 023026) have proposed a 'simplified' unfrustrated microscopic model that differs considerably from the models refined through decades of prior work. We show that the proposed model is at odds with known experimental data, including the reported magnetic susceptibility χ(T) data up to 550 K. Using an 8th order high-temperature expansion for χ(T), we show that the experimental data for Li2CuO2 are consistent with the prior model derived from inelastic neutron scattering studies. We also establish the T-range of validity for a Curie-Weiss law for the real frustrated magnetic system. We argue that the knowledge of the long-range ordered magnetic structure for T < T N and of χ(T) in a restricted T-range provides insufficient information to extract all of the relevant couplings in frustrated magnets; the saturation field and INS data must also be used to determine several exchange couplings, including the weak but decisive frustrating antiferromagnetic interchain couplings.",

keywords = "edge-sharing cuprates, exchange couplings, frustrated magnetism, high-temperature expansion, magnetic susceptibility",

author = "Kuzian, {R. O.} and R. Klingeler and Lorenz, {W. E.A.} and N. Wizent and S. Nishimoto and U. Nitzsche and H. Rosner and D. Milosavljevic and L. Hozoi and R. Yadav and J. Richter and A. Hauser and J. Geck and R. Hayn and V. Yushankhai and L. Siurakshina and C. Monney and T. Schmitt and J. Thar and G. Roth and T. Ito and H. Yamaguchi and M. Matsuda and S. Johnston and J. M{\'a}lek and Drechsler, {S. L.}",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s). Published by IOP Publishing Ltd on behalf of Deutsche Physikalische Gesellschaft.",

year = "2018",

month = may,

doi = "10.1088/1367-2630/aac159",

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Kuzian, RO, Klingeler, R, Lorenz, WEA, Wizent, N, Nishimoto, S, Nitzsche, U, Rosner, H, Milosavljevic, D, Hozoi, L, Yadav, R, Richter, J, Hauser, A, Geck, J, Hayn, R, Yushankhai, V, Siurakshina, L, Monney, C, Schmitt, T, Thar, J, Roth, G, Ito, T, Yamaguchi, H, Matsuda, M, Johnston, S, Málek, J & Drechsler, SL 2018, 'Comment on 'Oxygen vacancy-induced magnetic moment in edge-sharing CuO₂ chains of Li₂CuO₂'', New Journal of Physics, vol. 20, no. 5, 058001. https://doi.org/10.1088/1367-2630/aac159

TY - JOUR

T1 - Comment on 'Oxygen vacancy-induced magnetic moment in edge-sharing CuO2 chains of Li2CuO2'

AU - Kuzian, R. O.

AU - Klingeler, R.

AU - Lorenz, W. E.A.

AU - Wizent, N.

AU - Nishimoto, S.

AU - Nitzsche, U.

AU - Rosner, H.

AU - Milosavljevic, D.

AU - Hozoi, L.

AU - Yadav, R.

AU - Richter, J.

AU - Hauser, A.

AU - Geck, J.

AU - Hayn, R.

AU - Yushankhai, V.

AU - Siurakshina, L.

AU - Monney, C.

AU - Schmitt, T.

AU - Thar, J.

AU - Roth, G.

AU - Ito, T.

AU - Yamaguchi, H.

AU - Matsuda, M.

AU - Johnston, S.

AU - Málek, J.

AU - Drechsler, S. L.

PY - 2018/5

Y1 - 2018/5

N2 - In a recent work devoted to the magnetism of Li2CuO2, Shu et al (2017 New J. Phys. 19, 023026) have proposed a 'simplified' unfrustrated microscopic model that differs considerably from the models refined through decades of prior work. We show that the proposed model is at odds with known experimental data, including the reported magnetic susceptibility χ(T) data up to 550 K. Using an 8th order high-temperature expansion for χ(T), we show that the experimental data for Li2CuO2 are consistent with the prior model derived from inelastic neutron scattering studies. We also establish the T-range of validity for a Curie-Weiss law for the real frustrated magnetic system. We argue that the knowledge of the long-range ordered magnetic structure for T < T N and of χ(T) in a restricted T-range provides insufficient information to extract all of the relevant couplings in frustrated magnets; the saturation field and INS data must also be used to determine several exchange couplings, including the weak but decisive frustrating antiferromagnetic interchain couplings.

AB - In a recent work devoted to the magnetism of Li2CuO2, Shu et al (2017 New J. Phys. 19, 023026) have proposed a 'simplified' unfrustrated microscopic model that differs considerably from the models refined through decades of prior work. We show that the proposed model is at odds with known experimental data, including the reported magnetic susceptibility χ(T) data up to 550 K. Using an 8th order high-temperature expansion for χ(T), we show that the experimental data for Li2CuO2 are consistent with the prior model derived from inelastic neutron scattering studies. We also establish the T-range of validity for a Curie-Weiss law for the real frustrated magnetic system. We argue that the knowledge of the long-range ordered magnetic structure for T < T N and of χ(T) in a restricted T-range provides insufficient information to extract all of the relevant couplings in frustrated magnets; the saturation field and INS data must also be used to determine several exchange couplings, including the weak but decisive frustrating antiferromagnetic interchain couplings.

KW - edge-sharing cuprates

KW - exchange couplings

KW - frustrated magnetism

KW - high-temperature expansion

KW - magnetic susceptibility

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