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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. Enhancing Intrinsic Magnetic Hardness by Modulating Antagonistic Interactions in the Rare‐Earth‐Free Magnetic Solid Solution Hf 2 Fe 1−δ Ru 5−x Ir x+δ B 2

   https://doi.org/10.1002/chem.202303381  

   Luong, Diana ; Schumacher, Lars ; Kilic, Sam ; Haddon, Elena ; Pöttgen, Rainer ; Fokwa, Boniface P. T. ( January 2024 , Chemistry – A European Journal)

   The quinary members in the solid solution Hf₂Fe_1−δRu_5−xIr_x+δB₂(x=1–4, VE=63–66) have been investigated experimentally and computationally. They were synthesized via arc‐melting and analyzed by EDX and X‐ray diffraction. Density functional theory (DFT) calculations predicted a preference for magnetic ordering in all members, but with a strong competition between ferro‐ and antiferromagnetism arising from interchain Fe−Fe interactions. The spin exchange and magnetic anisotropy energies predicted the lowest magnetic hardness forx=1 and 3 and the highest forx=2. Magnetization measurements confirm the DFT predictions and demonstrate that the antiferromagnetic ordering (T_N=55–70 K) found at low magnetic fields changed to ferromagnetic (T_C=150–750 K) at higher fields, suggesting metamagnetic behavior for all samples. As predicted, Hf₂FeRu₃Ir₂B₂has the highest intrinsic coercivity (H_c=74 kA/m) reported to date for Ti₃Co₅B₂‐type phases. Furthermore, all coercivities outperform that of ferromagnetic Hf₂FeIr₅B₂, indicating the importance of AFM interactions in enhancing magnetic anisotropy in these materials. Importantly, two members (x=1 and 4) maintain intrinsic coercivities in the semi‐hard range at room temperature. This study opens an avenue for controlling magnetic hardness by modulating antagonistic AFM and FM interactions in low‐dimensional rare‐earth‐free magnetic materials.

    

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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)

   null (Ed.)
4. 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)

   null (Ed.)
5. 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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