Extreme in-plane upper critical magnetic fields of heavily doped quasi-two-dimensional transition metal dichalcogenides

Samuely, P.; Szabó, P.; Kačmarčı́k, J.; Meerschaut, A.; Cario, Laurent; Jansen, A. G. M.; Cren, T.; Kuzmiak, M.; Šofranko, Ondrej; Samuely, T.

doi:10.1103/physrevb.104.224507

Cited by 15 publications

(15 citation statements)

References 28 publications

(29 reference statements)

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“…Thus we find that t inter < 1.3 meV is achieved near n = 2 and 3, where the NbSe 2 separations are 12-15 Å. This result is consistent with large in-plane upper critical fields seen in the misfit layered compound (LaSe) 1.14 (NbSe 2 ) 1,2 , where NbSe 2 layers are also separated at 12 Å and may be electronically decoupled [40].…”

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confidence: 86%

Nonstoichiometric Salt Intercalation as a Means to Stabilize Alkali Doping of 2D Materials

et al. 2022

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Although doping with alkali atoms is a powerful technique for introducing charge carriers into physical systems, the resulting charge-transfer systems are generally not air stable. Here we describe computationally a strategy towards increasing the stability of alkali-doped materials that employs stoichiometrically unbalanced salt crystals with excess cations (which could be deposited during e.g. in situ gating) to achieve doping levels similar to those attained by pure alkali metal doping. The crystalline interior of the salt crystal acts as a template to stabilize the excess dopant atoms against oxidation and deintercalation, which otherwise would be highly favorable. We characterize this doping method for graphene, NbSe2, and Bi2Se3 and its effect on direct-to-indirect bandgap transitions, 2D superconductivity, and thermoelectric performance. Salt intercalation should be generally applicable to systems which can accommodate this "ionic crystal" doping (and particularly favorable when geometrical packing constraints favor non-stoichiometry).

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confidence: 86%

Nonstoichiometric Salt Intercalation as a Means to Stabilize Alkali Doping of 2D Materials

et al. 2022

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“…Thickness of the superconducting layer is ≈8 nm, which is larger than d FWHM , further supporting the possibility that the observed superconductivity has a mixed-dimensional character. Such a crossover in the dimensionality of superconductivity has already been shown to drastically enhance H c2 (38,39,40).…”

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confidence: 95%

Anisotropic superconductivity at KTaO ₃ (111) interfaces

et al. 2023

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A two-dimensional, anisotropic superconductivity was recently found at the KTaO 3 (111) interfaces. The nature of the anisotropic superconducting transition remains a subject of debate. To investigate the origins of the observed behavior, we grew epitaxial KTaO 3 (111)-based heterostructures. We show that the superconductivity is robust against the in-plane magnetic field and violates the Pauli limit. We also show that the Cooper pairs are more resilient when the bias is along [11 2 ¯ ] (I ∥ [11 2 ¯ ]) and the magnetic field is along [1 1 ¯ 0] ( B ∥ [1 1 ¯ 0]). We discuss the anisotropic nature of superconductivity in the context of electronic structure, orbital character, and spin texture at the KTaO 3 (111) interfaces. The results point to future opportunities to enhance superconducting transition temperatures and critical fields in crystalline, two-dimensional superconductors with strong spin-orbit coupling.

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“…Another example are graphene/FeCl3 heterostructures (formerly known as graphite intercalation compounds) consisting of alternating graphene and FeCl3 layers as first identified and pioneered by Ibers, et al in 1956 13 . Misfit layered compounds are thus related to other classes of heterostructured materials in that they also form large superstructures from their component materials and there can be significant modification of electronic and physical properties, as well as interactions between the component materials via interfacial processes, which can produce interesting physical phenomena [10][11][12][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] . There are significant structural distortions which further modifies the physical properties of the bulk material due to the lattice mismatch between physically dissimilar components.…”

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confidence: 99%

Misfit layered compounds: Unique, tunable heterostructured materials with untapped properties

McQueen

2022

APL Materials

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Building on discoveries in graphene and two-dimensional (2D) transition metal dichalcogenides, van der Waals (VdW) layered heterostructures—stacks of such 2D materials—are being extensively explored with resulting new discoveries of novel electronic and magnetic properties in the ultrathin limit. Here, we review a class of naturally occurring heterostructures—the so-called misfits—that combine disparate VdW layers with complex stacking. Exhibiting remarkable structural complexity and diversity of phenomena, misfits provide a platform on which to systematically explore the energetics and local bonding constraints of heterostructures and how they can be used to engineer novel quantum fabrics, electronic responsiveness, and magnetic phenomena. Like traditional classes of layered materials, they are often exfoliatable and thus also incorporatable as units in manually or robotically stacked heterostructures. Here, we review the known classes of misfit structures, the tools for their single crystal and thin film synthesis, the physical properties they exhibit, and the computational and characterization tools available to unravel their complexity. Directions for future research are also discussed.

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Extreme in-plane upper critical magnetic fields of heavily doped quasi-two-dimensional transition metal dichalcogenides

Cited by 15 publications

References 28 publications

Nonstoichiometric Salt Intercalation as a Means to Stabilize Alkali Doping of 2D Materials

Nonstoichiometric Salt Intercalation as a Means to Stabilize Alkali Doping of 2D Materials

Anisotropic superconductivity at KTaO ₃ (111) interfaces

Misfit layered compounds: Unique, tunable heterostructured materials with untapped properties

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Extreme in-plane upper critical magnetic fields of heavily doped quasi-two-dimensional transition metal dichalcogenides

Cited by 15 publications

References 28 publications

Nonstoichiometric Salt Intercalation as a Means to Stabilize Alkali Doping of 2D Materials

Nonstoichiometric Salt Intercalation as a Means to Stabilize Alkali Doping of 2D Materials

Anisotropic superconductivity at KTaO 3 (111) interfaces

Misfit layered compounds: Unique, tunable heterostructured materials with untapped properties

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Product

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Anisotropic superconductivity at KTaO ₃ (111) interfaces