Tailored Ising superconductivity in intercalated bulk NbSe2

Zhang, Haoxiong; Rousuli, Awabaikeli; Zhang, Kenan; Luo, Laipeng; Guo, Chunjie; Cong, Xin; Lin, Zuzhang; Bao, Changhua; Zhang, Hongyun; Xu, Shengnan; Feng, Runfa; Shen, Shengchun; Zhao, Kun; Yao, Wei; Wu, Yang; Ji, Shuai‐Hua; Chen, X.; Tan, Ping‐Heng; Xue, Quan; Xu, Yong; Duan, Wenhui; Yu, Pu

doi:10.1038/s41567-022-01778-7

Cited by 68 publications

(36 citation statements)

References 39 publications

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“…1d and Supplementary Information). The 𝐵 C2|| 𝐵 Pauli ⁄ vs. 𝑇 C relation of our Co-NbSe2 behaves similarly to that of few-layer NbSe2 flakes [17] , which also agrees with the recent discovery of reduced dimensionality in an intercalated bulk NbSe2 achieved by a different means [29] . We also studied devices where the BN buffer layer was transparent or missing altogether.…”

Section: Device Design and Magnetic Intercalationsupporting

confidence: 90%

Ferromagnetic Superconductivity in Two-dimensional Niobium Diselenide

Qu,

Jin,

Hou

et al. 2023

Preprint

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The co-existence of ferromagnetism and superconductivity becomes possible through unconventional pairing in the superconducting state. Such materials are exceedingly rare in solid-state systems but are promising platforms to explore topological phases, such as Majorana bound states. Theoretical investigations date back to the late 1950s, but only a few systems have been experimentally identified as the potential host. Here, we show that atomically-thin niobium diselenide (NbSe2) intercalated with dilute cobalt atoms spontaneously displays ferromagnetism below the superconducting transition temperature (T_C). We elucidate the origin of this phase by constructing a magnetic tunnel junction that consists of cobalt and cobalt-doped niobium diselenide (Co-NbSe2) as the two ferromagnetic electrodes, with an ultra-thin boron nitride as the tunnelling barrier. At a temperature well below T_C, the tunnelling magnetoresistance shows a bistable state, suggesting a ferromagnetic order in Co-NbSe2. We propose a Ruderman–Kittel–Kasuya–Yosida exchange coupling mechanism based on spin-triplet superconducting order parameter to mediate such ferromagnetism. We further perform non-local lateral spin valve measurements to confirm the origin of the ferromagnetism. The Hanle precession signals show spin diffusion length up to micrometres below T_C, demonstrating an intrinsic spin-triplet nature in superconducting NbSe2. Our discovery of superconductivity-mediated ferromagnetism opens the door to the alternative design of ferromagnetic superconductors.

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Section: Device Design and Magnetic Intercalationsupporting

confidence: 90%

Ferromagnetic Superconductivity in Two-dimensional Niobium Diselenide

Qu,

Jin,

Hou

et al. 2023

Preprint

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“…As shown in Figure e, the positions of the other characteristic peaks of NbSe 2 are essentially the same, except for the different substrate diffraction peaks. The typical (002), (004), (006), and (008) characteristic peaks of NbSe 2 correspond to similar crystallographic orientations and demonstrate that NbSe 2 films have the same two-dimensional growth mode on arbitrary substrates . The full-scale XRD patterns and SEM images are presented in Figure S9 and Figure S10.…”

mentioning

confidence: 82%

“…To meet the demands for large-scale fabrication and applications of superconducting devices, high-quality and large-area (up to inch-scale) films on the desired substrates are the prerequisite. − Currently, NbSe 2 crystals grown by chemical vapor deposition exhibit thickness tunability from monolayer to bulk with flake sizes on the micron scale . Mechanical exfoliation can yield the highest quality micron-sized NbSe 2 monolayers on various substrates .…”

mentioning

confidence: 99%

van der Waals Self-Epitaxial Growth of Inch-Sized Superconducting Niobium Diselenide Films

Wang

et al. 2023

Nano Lett.

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Ultrathin superconducting films are the basis of superconductor devices. van der Waals (vdW) NbSe 2 with noncentrosymmetry exhibits exotic superconductivity and shows promise in superconductor electronic devices. However, the growth of inch-scale NbSe 2 films with layer regulation remains a challenge because vdW structural material growth is strongly dependent on the epitaxial guidance of the substrate. Herein, a vdW self-epitaxy strategy is developed to eliminate the substrate driving force in film growth and realize inch-sized NbSe 2 film growth with thicknesses from 2.1 to 12.1 nm on arbitrary substrates. The superconducting transition temperature of 5.1 K and superconducting transition width of 0.30 K prove the top homogeneity and quality of superconductivity among all of the synthetic NbSe 2 films. Coupled with a large area and substrate compatibility, this work paves the way for developing NbSe 2 superconductor electronics.

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“…In 2022, the phase-selective synthesis of trigonal and monoclinic Cr 5 Te 8 crystals was achieved, using chemical vapor deposition . The successful experimental SI realization in 2D materials paves a new way to modulate the magnetoelectric properties of 2D materials. ,,,, …”

Section: Introductionmentioning

confidence: 99%

Tailing the Magnetoelectric Properties of Cr₂Ge₂Te₆ by Engineering Covalently Bonded Cr Self-Intercalation: Ferromagnetic Half-Metal

Guan

et al. 2023

ACS Appl. Electron. Mater.

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Two-dimensional intrinsic ferromagnetic half-metals (HMs) are important for spintronics. Based on a systematic research of CrGeTe 3 (CGT) bilayers and multilayers with the self-intercalated (SI) Cr (Cr SI ) atom, we find that self-intercalation can enhance interlayer magnetic coupling, which results in a super-exchange interaction between interlayers. The CGT bilayer keeps halfmetallicity with the interlayer ferromagnetic (FM) order after Cr's selfintercalation, independent of Cr SI atoms' concentration and stacking orders. Moreover, SI-CGT multilayers with interlayer FM order transform from HMs into normal spin-polarized metals, as the states at the Fermi level increase. Moreover, the magnetic anisotropy energies (MAEs) of SI-CGT-AA and SI-CGT-AB are −0.160 and −0.42 meV/f.u., respectively, which are modulated by the Cr SI atoms. The MAEs of SI-CGT-AA and SI-CGT-AB are different, as the hybridization interactions between Cr's d orbitals are different from each other. SI-CGT bilayers' magnetic easy axis (EA) switches from the original [001] of CGT to the [100] direction, independent of the stacking orders. It is inferred that the MAE is mainly contributed by the hybridization between Te's p x and p y , p y and p z orbitals, and that this hybridization interaction is obviously weakened as Cr SI atom is inserted. The SI-CGT bilayers and multilayers show good dynamic and thermal stability at 300 and 500 K. These findings offer a promising way to manipulate the interlayer exchange interaction and magnetoelectric properties of CGT multilayers and other vdW magnets.

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Tailored Ising superconductivity in intercalated bulk NbSe2

Cited by 68 publications

References 39 publications

Ferromagnetic Superconductivity in Two-dimensional Niobium Diselenide

Ferromagnetic Superconductivity in Two-dimensional Niobium Diselenide

van der Waals Self-Epitaxial Growth of Inch-Sized Superconducting Niobium Diselenide Films

Tailing the Magnetoelectric Properties of Cr₂Ge₂Te₆ by Engineering Covalently Bonded Cr Self-Intercalation: Ferromagnetic Half-Metal

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Tailored Ising superconductivity in intercalated bulk NbSe2

Cited by 68 publications

References 39 publications

Ferromagnetic Superconductivity in Two-dimensional Niobium Diselenide

Ferromagnetic Superconductivity in Two-dimensional Niobium Diselenide

van der Waals Self-Epitaxial Growth of Inch-Sized Superconducting Niobium Diselenide Films

Tailing the Magnetoelectric Properties of Cr2Ge2Te6 by Engineering Covalently Bonded Cr Self-Intercalation: Ferromagnetic Half-Metal

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Tailing the Magnetoelectric Properties of Cr₂Ge₂Te₆ by Engineering Covalently Bonded Cr Self-Intercalation: Ferromagnetic Half-Metal