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1. Superconductive coupling in tailored [(SnSe) _1+δ ] _m (NbSe ₂ ) ₁ multilayers

   https://doi.org/10.1088/1361-6668/aabb3f  

   Trahms, Martina; Grosse, Corinna; Alemayehu, Matti B; Hite, Omar K; Chiatti, Olivio; Mogilatenko, Anna; Johnson, David C; Fischer, Saskia F (June 2018, Superconductor Science and Technology)
2. Exfoliable Transition Metal Chalcogenide Semiconductor NbSe ₂ I ₂

   https://doi.org/10.1021/acs.inorgchem.3c03493  

   Qu, Kejian; Zhang, Yue; Peng, Cheng; Riedel, Zachary W.; Won, Juyeon; Zhang, Rong; Woods, Toby J.; Devereaux, Tom; van der Zande, Arend M.; Shoemaker, Daniel P. (January 2024, Inorganic Chemistry)

   As the field of exfoliated van der Waals electronics grows to include complex heterostructures, the variety of available in-plane symmetries and geometries becomes increasingly valuable. In this work, we present an efficient chemical vapor transport synthesis of NbSe2I2 with the triclinic space group P1̅. This material contains Nb–Nb dimers and an in-plane crystallographic angle γ = 61.3°. We show that NbSe2I2 can be exfoliated down to few-layer and monolayer structures and use Raman spectroscopy to test the preservation of the crystal structure of exfoliated thin films. The crystal structure was verified by single-crystal and powder X-ray diffraction methods. Density functional theory calculations show triclinic NbSe2I2 to be a semiconductor with a band gap of around 1 eV, with similar band structure features for bulk and monolayer crystals. The physical properties of NbSe2I2 have been characterized by transport, thermal, optical, and magnetic measurements, demonstrating triclinic NbSe2I2 to be a diamagnetic semiconductor that does not exhibit any phase transformation below room temperature. 

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3. Designed Synthesis and Structure–Property Relationships of Kinetically Stable [(PbSe) _1+δ ] _m (VSe ₂ ) ₁ ( m = 1, 2, 3, 4) Heterostructures

   https://doi.org/10.1021/acs.chemmater.9b02826  

   Cordova, Dmitri Leo; Fender, Shannon Sanaya; Kam, Taryn Meiko; Seyd, Johannes; Albrecht, Manfred; Lu, Ping; Fischer, Robert; Johnson, David C. (September 2019, Chemistry of Materials)

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4. Unusual superconductivity in the topological nodal-line semimetal candidate Sn _x NbSe _2-δ

   https://doi.org/10.1088/1742-6596/2164/1/012008  

   Munir, Riffat; Hasan Siddiquee, K A; Dissanayake, Charuni; Kumarasinghe, Kapila; Hu, Xinzhe; Takano, Yasumasa; Choi, Eun Sang; Nakajima, Yasuyuki (March 2022, Journal of Physics: Conference Series)

   Abstract We report the superconductivity of the topological nodal-line semimetal candidate Sn x NbSe 2- δ with a noncentrosymmetric crystal structure. The superconducting transition temperature T c of Sn x NbSe 2- δ drastically varies with the Sn concentration x and the Se deficiency δ , and reaches 12 K, relatively higher than those of known topological superconductors. The upper critical field of this compound shows unusual temperature dependence, inconsistent with the WHH theory for conventional type-II superconductors. In a low-T c sample, the zero-temperature limit of the upper critical field parallel to the ab plane exceeds the Pauli paramagnetic limit estimated from the simple BCS weak coupling model by a factor of ∼ 2, suggestive of unusual superconductivity stabilized in Sn x NbSe 2- δ . Together with the robust superconductivity against disorder, these observations indicate that Sn x NbSe 2- δ is a promising candidate to explore topological superconductivity. 

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5. Unusual upper critical fields of the topological nodal-line semimetal candidate Sn _x NbSe _2−δ

   https://doi.org/10.1088/1361-648X/abf386  

   Munir, Riffat; Siddiquee, K A; Dissanayake, Charuni; Hu, Xinzhe; Takano, Yasumasa; Choi, Eun Sang; Nakajima, Yasuyuki (May 2021, Journal of Physics: Condensed Matter)

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