Signature for non-Stoner ferromagnetism in the van der Waals ferromagnet 
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Xu, Xiangyang; Li, Y. W.; Duan, Shaorong; Zhang, S. L.; Chen, Y. J.; Kang, Lili; Liang, Aiji; Chen, C.; Xia, Wei; Xu, Yong; Malinowski, Paul; Xu, Xiaodong; Chu, Jiun‐Haw; Li, Gang; Guo, Yanfeng; Liu, Z. K.; Yang, Lexian; Chen, Y. L.

doi:10.1103/physrevb.101.201104

Cited by 47 publications

(39 citation statements)

References 31 publications

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“…Therefore, the resulting calculating net magnetic moment is 3.0 μB and 2.6 μB for Fe 3+ and Fe 2+ ions, respectively. The localized a1 and delocalized e1/e2 states results in the unique magnetism in 2D Fe3GeTe2, which possessed the coexistence of local and itinerant magnetism, consistent with a previous report by Yang et al 22 Obviously, the feature of localized magnetism play a crucial role in electronic and magnetism of metallic ferromagnetic Fe3GeTe2 system.…”

Section: Resultssupporting

confidence: 91%

“…21 Yang et al noticed that the band dispersions of Fe3GeTe2 barely change upon heating towards the ferromagnetic transition near 225 K, which also strongly deviates from itinerant Stoner model. 22 Deng et al used localized Heisenberg model to properly estimate the magnetic properties in 2D Fe3GeTe2, which consistent with the experiment results. 14 All these results suggest that the local magnetic moments may play a crucial role in the ferromagnetic ordering of Fe-Ge-Te systems.…”

supporting

confidence: 60%

“…Within the itinerant Stoner model, the ferromagnetic metal will exhibit a temperature-dependent exchange splitting that disappears above TC. 22 measured. 26 Therefore, we need a new model to describe the complicated ferromagnetism in Fe3GeTe2 systems.…”

Section: Magnetic Coupling Mechanism and Curie Temperatures Of 2d Fe3gete2mentioning

confidence: 99%

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Layer-dependent magnetic phase diagram in FenGeTe2 (3≤n≤7) ultrathin films: coexistence of localized and itinerant electronic states of Fe with variable valence

Liu

Xing

Guo

et al. 2021

Preprint

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Two-dimensional (2D) ferromagnets with high Curie temperature (TC) are highly desirable due to their potential applications in spintronic devices. However, they are rarely obtained in experiments mainly due to the challenge of synthesizing high-quality 2D crystals, and their TC values are below the room temperature. By first-principles calculations, herein we design a family of stable 2D FenGeTe2 (4≤n≤7) ultrathin films that are similar to the reported Fe3GeTe2, which exhibit coexistence of itinerant and localized magnetism. Among them, 2D Fe3GeTe2 and Fe4GeTe2 are ferromagnetic metals with TC of 138 K and 68 K, respectively; 2D Fe5GeTe2, Fe6GeTe2 and Fe7GeTe2 ultrathin films are Néel’s P-types, R-type, R-type ferrimagnetic metals with TC of 320 K, 450 K and 570 K, respectively. The thickness induced magnetic phase transition is mainly originated from the competition between itinerant and localized states, which is also correlate well with the content of Fe3+ and Fe2+ ions. A valence/orbital dependent magnetic exchange model is proposed to clarify such interesting thickness and composition effect. Our results not only endow 2D Fe-Ge-Te ultrathin films as promising candidates for spintronics at room temperature, but also propose a universal mechanism to understand the magnetic coupling in complex magnetic systems.

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Section: Resultssupporting

confidence: 91%

supporting

confidence: 60%

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Layer-dependent magnetic phase diagram in FenGeTe2 (3≤n≤7) ultrathin films: coexistence of localized and itinerant electronic states of Fe with variable valence

Liu

Xing

Guo

et al. 2021

Preprint

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“…Previous studies have focused on itinerant magnets with 3 d transition metals, where electronic bands are broad due to the strongly correlated nature of the system and the observed effects on quasiparticle properties are small. The phenomenon of FM band splitting was demonstrated, for example, in elemental Ni 6 , and a more recent angle-resolved photoemission spectroscopy (ARPES) study on Fe 3 GeTe 2 also revealed FM exchange splitting with reduced quasiparticle coherence 7 . Rare-earth-based FM materials with local magnetic moments and weakly correlated conduction electron bands are a much better platform for studying the impact of FM order on electronic quasiparticle properties.…”

Section: Introductionmentioning

confidence: 95%

Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet

Trevisan

Wang

et al. 2021

Nat Commun

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Electrons navigate more easily in a background of ordered magnetic moments than around randomly oriented ones. This fundamental quantum mechanical principle is due to their Bloch wave nature and also underlies ballistic electronic motion in a perfect crystal. As a result, a paramagnetic metal that develops ferromagnetic order often experiences a sharp drop in the resistivity. Despite the universality of this phenomenon, a direct observation of the impact of ferromagnetic order on the electronic quasiparticles in a magnetic metal is still lacking. Here we demonstrate that quasiparticles experience a significant enhancement of their lifetime in the ferromagnetic state of the low-density magnetic semimetal EuCd2As2, but this occurs only in selected bands and specific energy ranges. This is a direct consequence of the magnetically induced band splitting and the multi-orbital nature of the material. Our detailed study allows to disentangle different electronic scattering mechanisms due to non-magnetic disorder and magnon exchange. Such high momentum and energy dependence quasiparticle lifetime enhancement can lead to spin selective transport and potential spintronic applications.

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“…Even in materials such as Fe 3 GeTe 2 , with intermediate T C ¼ 230 K, the thermal evolution appears to be dominated by a suppression of quasiparticle lifetime, without significant coherent evolution of the dispersion [35][36][37]. Using newly available high-quality single crystals combined with state-of-the-art variable-temperature photoemission spectroscopy, we have found that a large and previously overlooked energy shift of a topological spin-orbit gapped Weyl loop occurs in Co 3 Sn 2 S 2 across T C ¼ 176 K [38][39][40][41][42][43].…”

mentioning

confidence: 99%

Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet

et al. 2021

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Signature for non-Stoner ferromagnetism in the van der Waals ferromagnet Fe3GeTe2

Cited by 47 publications

References 31 publications

Layer-dependent magnetic phase diagram in FenGeTe2 (3≤n≤7) ultrathin films: coexistence of localized and itinerant electronic states of Fe with variable valence

Layer-dependent magnetic phase diagram in FenGeTe2 (3≤n≤7) ultrathin films: coexistence of localized and itinerant electronic states of Fe with variable valence

Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet

Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet

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