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   Wen, Feng ; Dillen, David C. ; Kim, Kyounghwan ; Tutuc, Emanuel ( June 2017 , Journal of Applied Physics)
2. Magnetic moments and spin structure in single-phase B20 Co 1+x Si 1−x (x = 0.043)

   https://doi.org/10.1063/5.0090545  

   Wang, Haohan ; Balasubramanian, Balamurugan ; Liu, Yaohua ; Streubel, Robert ; Pahari, Rabindra ; Ekanayaka, Thilini Kumari ; Mishra, Esha ; Klewe, Christoph ; Shafer, Padraic ; Dhall, Rohan ; et al ( May 2022 , Journal of Applied Physics)

   Neutron powder diffraction (NPD) and x-ray magnetic circular dichroism (XMCD) spectroscopy are employed to investigate the magnetism and spin structure in single-phase B20 Co_1.043Si_0.957. The magnetic contributions to the NPD data measured in zero fields are consistent with the helical order among the allowed spin structures derived from group theory. The magnitude of the magnetic moment is (0.3 ± 0.1) μ_B/Co according to NPD, while the surface magnetization probed by XMCD at 3 kOe is (0.18–0.31) μ_B/Co. Both values are substantially larger than the bulk magnetization of 0.11 μ_B/Co determined from magnetometry at 70 kOe and 2 K. These experimental data indicate the formation of a helical spin phase and the associated conical states in high magnetic fields.

    

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3. Magnetic and magnetocaloric properties of Pr 2-x Nd x Fe 17 ribbons

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4. Synthesis and Characterization of Single-Phase Metal Dodecaboride Solid Solutions: Zr 1–x Y x B 12 and Zr 1–x U x B 12

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   Akopov, Georgiy ; Mak, Wai H. ; Koumoulis, Dimitrios ; Yin, Hang ; Owens-Baird, Bryan ; Yeung, Michael T. ; Muni, Mit H. ; Lee, Shannon ; Roh, Inwhan ; Sobell, Zachary C. ; et al ( May 2019 , Journal of the American Chemical Society)
5. Superconductivity and Pronounced Electron‐Phonon Coupling in Rock‐Salt Al 1−x O 1−x and Ti 1−x O 1−x

   https://doi.org/10.1002/aelm.202400141  

   Žguns, Pjotrs ; Gedik, Nuh ; Yildiz, Bilge ; Li, Ju ( May 2024 , Advanced Electronic Materials)

   The highest ambient‐pressure Tc among binary compounds is 40 K (MgB2). Higher Tc is achieved in high‐pressure hydrides or multielement cuprates. Alternatively, are explored superconducting properties of binary, metastable sub‐oxides, that may emerge under extremely low oxygen partial pressure. The emphasis is on the rock‐salt structure, which is known to promote superconductivity, and exploring AlO, ScO, TiO, and NbO. Dynamic lattice stability is achieved by introducing metal and oxygen vacancies in the fashion of Nb_1−xO_1−x‐type structure (x = ¼). The electron‐phonon (e‐ph) coupling is remarkably large in Al_1−xO_1−xand Ti_1−xO_1−x(λ ≈ 2 at x = ¼), with Tc ≈ 35 K according to the Allen–Dynes equation. Significantly, the coupling strength is comparable to that in high‐pressure hydrides, yet, in contrast to hydrides and MgB2, the coupling is largely driven by low frequency phonons. Sc_1−xO_1−xand Nb_1−xO_1−xshow significantly smaller λ and Tc. Further, hydrogen intercalation to boost λ and Tc is investigated. Only Ti_1−x(O_1−xHx) and Nb_1−x(O_1−xHx) are dynamically stable upon intercalation, where H, respectively, decreases and increases Tc. The effect of H doping on electronic structure and Tc is discussed. Altogether, the study suggests that metal sub‐oxides are promising compounds to achieve strong e‐ph coupling at ambient pressure.

    

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