Comment on “Proper and improper chiral magnetic interactions”

Cardias, Ramon; Szilva, Attila; Bergman, Anders; Kvashnin, Yaroslav; Fransson, Jonas; Streib, Simon; Delin, Anna; Katsnelson, M. I.; Thonig, Danny; Klautau, A. B.; Eriksson, Olle; Nordström, Lars

doi:10.1103/physrevb.105.026401

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…The resulting spin model correctly describes the thermodynamics of the spin system, despite the relatively small moment and small ordering temperature. It is possible that an improvement could be achieved by performing the RTM calculations with a non-collinear reference state that closely resembles the ground state of the system, however there is a strong debate still in the literature on the calculation of spin models from non-collinear reference states [28,29,30,31].…”

Section: Discussionmentioning

confidence: 99%

Incommensurate magnetic ordering in CrB₂

Deák

Jackson

Nyári

et al. 2022

J. Phys.: Condens. Matter

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Incommensurate magnetism in CrB2 is studied in terms of a spin model based on density functional theory calculations. Heisenberg exchange interactions derived from the paramagnetic phase using the disordered local moment theory show significant differences compared with those resulting from the treatment of the material as a ferromagnet; of these two methods, the disordered local moment theory is found to give a significantly more realistic description. We calculate strongly ferromagnetic interactions between Cr planes but largely frustrated interactions within Cr planes. Although we find that the ground state ordering vector is sensitive to exchange interactions over a large number of neighbour shells, the q-vector of the incommensurate spin spiral state is satisfactorily reproduced by the theory (0.213 compared with the known ordering vector 0.285 × (2π)/(a/2) along Γ − K). The strong geometric frustration of the exchange interactions causes a rather low Néel temperature (about 97 K), also in good agreement with experiment.

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Section: Discussionmentioning

confidence: 99%

Incommensurate magnetic ordering in CrB₂

Deák

Jackson

Nyári

et al. 2022

J. Phys.: Condens. Matter

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“…This basically means that such a Hamiltonian cannot be used for such a system within the whole range of temperatures and global magnetic states, at least if one requires that its parameters should not depend on a particular magnetic configuration, something which is the topic of recent discussions [9,11,12]. Nevertheless, the whole formalism of a classical Heisenberg Hamiltonian can still make sense and produce reasonably accurate results when it is applied within a limited range of external parameters (temperature and pressure) and for a restricted set of magnetic configurations.…”

Section: Introductionmentioning

confidence: 99%

The effect of longitudinal spin-fluctuations on high temperature properties of Co$_3$Mn$_2$Ge

Delczeg‐Czirjak¹,

Eriksson²,

Ruban³

2022

Preprint

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It is demonstrated that thermally induced longitudinal spin fluctuations (LSF) play an important role in itinerant Co3Mn2Ge at an elevated temperature. The effect of LSF is taken into account during ab initio calculations via a simple model for the corresponding entropy contribution. We show that the magnetic entropy leads to the appearance of a medium size local moment on Co atoms. As a consequence, this leads to a renormalization of the magnetic exchange interactions with a quite substantial impact upon the caluclated Curie temperature. Taking LSF into account, the calculated Curie temperature can be brought to be in good agreement with the experimental value.

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