Magnetic frustration in a van der Waals metal CeSiI

Okuma, Ryutaro; Ritter, C.; Okada, Yoshinori

doi:10.1103/physrevmaterials.5.l121401

Cited by 11 publications

(6 citation statements)

References 53 publications

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“…However, Ce do not change upon surface doping on the upper iodine layer. CeSiI monolayer is located above the CeCoIn 5 point, indicating a magnetically ordered ground state and it is consistent with the recent experimental result on bulk CeSiI 31 . It is rather located closer to CeIn 3 and CeCu 2 Ge 2 .…”

Section: Structural and Electronic Properties Of Cesiisupporting

confidence: 91%

“…Considering these aspects, we conclude CeSiI is the most promising candidate for 2D vdW heavy-fermion systems among 32 exfoliable lanthanide compounds. Very recently, it was reported that bulk CeSiI has a magnetically ordered ground state 31 . However, it can be sensitively tuned by external perturbations, which will be discussed in later sections.…”

Section: Screening From the Databasementioning

confidence: 99%

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Exploring two-dimensional van der Waals heavy-fermion material: Data mining theoretical approach

et al. 2022

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The discovery of two-dimensional (2D) van der Waals (vdW) materials often provides interesting playgrounds to explore novel phenomena. One of the missing components in 2D vdW materials is the intrinsic heavy-fermion systems, which can provide an additional degree of freedom to study quantum critical point (QCP), unconventional superconductivity, and emergent phenomena in vdW heterostructures. Here, we investigate 2D vdW heavy-fermion candidates through the database of experimentally known compounds based on dynamical mean-field theory calculation combined with density functional theory (DFT+DMFT). We have found that the Kondo resonance state of CeSiI does not change upon exfoliation and can be easily controlled by strain and surface doping. Our result indicates that CeSiI is an ideal 2D vdW heavy-fermion material and the quantum critical point can be identified by external perturbations.

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Section: Structural and Electronic Properties Of Cesiisupporting

confidence: 91%

Section: Screening From the Databasementioning

confidence: 99%

Exploring two-dimensional van der Waals heavy-fermion material: Data mining theoretical approach

et al. 2022

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“…We can observe a robust ab initio estimation of these quantities; i.e., they are shown to be independent of the onsite Coulomb interaction of the f-electrons U . An anti-ferromagnetic J 1 is obtained in good agreement with magnetometry measurements which suggests that the phase diagram of the competing J K – J 1 triangular Kondo lattice (eq ) would display a quantum critical phase between a frustrated magnetic order and the heavy-fermion order, − instead of the usual quantum critical point between a ferromagnetic and heavy-fermion order (Figure d). DFT+ U provides an estimation of J 1 ≃ 30 meV and J K ≃ −100 meV, which suggests that monolayer CeSiI can enter the heavy-fermion phase dominated by J K , but with a non-negligible magnetic exchange J 1 between the f-electrons.…”

supporting

confidence: 68%

Nature of the Unconventional Heavy-Fermion Kondo State in Monolayer CeSiI

Fumega,

Lado

2024

Nano Lett.

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CeSiI has been recently isolated in the ultrathin limit, establishing CeSiI as the first intrinsic two-dimensional van der Waals heavy-fermion material up to 85 K. We show that, due to the strong spin−orbit coupling, the local moments develop a multipolar real-space magnetic texture, leading to local pseudospins with a nearly vanishing net moment. To elucidate its Kondoscreened regime, we extract from first-principles the parameters of the Kondo lattice model describing this material. We develop a pseudofermion methodology in combination with ab initio calculations to reveal the nature of the heavy-fermion state in CeSiI. We analyze the competing magnetic interactions leading to an unconventional heavy-fermion order as a function of the magnetic exchange between the localized f-electrons and the strength of the Kondo coupling. Our results show that the magnetic exchange interactions promote an unconventional momentumdependent Kondo-screened phase, establishing the nature of the heavy-fermion state observed in CeSiI.

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“…[9] The metallic elements mainly come from 3d transition metals such as Cr and Fe and gradually expanded to 4f rare-earth metals such as Ce and Dy recently. [20,44,52,68,69] The typical magnetism of pristine vdW magnets in experiments is also classified in Fig. 2.…”

Section: Magnetism and Synthesis Of Vdw Magnetsmentioning

confidence: 99%

“…[111,112] Rare-earth halide CeSiI is a recently discovered vdW magnetic compound hosting a coexistence of itinerant electron and frustrated magnetism. [68] There is still plenty of materials to be explored in experiments, some of which have been predicted, such as Dirac half-metal CrSeTe, [113,114] valleytronic semiconductor LaBr 2 . [115,116] The common synthesis methods for 2D vdW magnetic compounds are summarized in Fig.…”

Section: Magnetism and Synthesis Of Vdw Magnetsmentioning

confidence: 99%

Magnetic van der Waals materials: Synthesis, structure, magnetism, and their potential applications

Lin

Peng

et al. 2022

Chinese Phys. B

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As the family of magnetic materials is rapidly growing, two-dimensional (2D) van der Waals (vdW) magnets have attracted increasing attention as a platform to explore fundamental physical problems of magnetism and their potential applications. This paper reviews the recent progress on emergent vdW magnetic compounds and their potential applications in devices. First, we summarize the current vdW magnetic materials and their synthetic methods. Then, we focus on their structure and the modulation of magnetic properties by analyzing the representative vdW magnetic materials with different magnetic structures. In addition, we pay attention to the heterostructures of vdW magnetic materials, which are expected to produce revolutionary applications of magnetism-related devices. To motivate the researchers in this area, we finally provide the challenges and outlook on 2D vdW magnetism.

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Magnetic frustration in a van der Waals metal CeSiI

Cited by 11 publications

References 53 publications

Exploring two-dimensional van der Waals heavy-fermion material: Data mining theoretical approach

Exploring two-dimensional van der Waals heavy-fermion material: Data mining theoretical approach

Nature of the Unconventional Heavy-Fermion Kondo State in Monolayer CeSiI

Magnetic van der Waals materials: Synthesis, structure, magnetism, and their potential applications

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