The Cu substitution effect on the superconductivity of LiFeAs has been studied in comparison with Co/Ni substitution. It is found that the shrinking rate of the lattice parameter c for Cu substitution is much smaller than that of Co/Ni substitution. This is in conjugation with the observation of ARPES that shows almost the same electron and hole Fermi surfaces (FSs) size for undoped and Cu substituted LiFeAs sample, except for a very small hole band sinking below Fermi level with doping. This indicates that there is little doping effect at Fermi surface by Cu substitution, in sharp contrast to the more effective carrier doping effect by Ni or Co.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1088/0953-8984/26/43/435703 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Robust dioxin-linked metallophthalocyanine tbo topology covalent organic frameworks and their photocatalytic properties.
Natl Sci Rev
January 2025
Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry and Chemical Engineering, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Constructing 3D functional covalent organic frameworks (COFs) with both robust linkage and planar macrocycle building blocks still remains a challenge due to the difficulty in adjusting both the crystallinity and the dominant 2D structures. In addition, it is also challenging to selectively convert inert C(sp)-H bonds into value-added chemicals. Herein, robust 3D COFs, USTB-28-M (M=Co, Ni, Cu), have been polymerized from the nucleophilic aromatic substitution reaction of -symmetric 2,3,6,7,14,15-hexahydroxyltriptycene with -symmetric hexadecafluorophthalocyanine (MPcF) under solvothermal conditions.
View Article and Find Full Text PDFLow-Temperature Sintering and Microwave Dielectric Properties of CuZnTiZrNbO Ceramics with the Aid of LiF.
Materials (Basel)
December 2024
School of Science, Harbin Institute of Technology, Shenzhen 518055, China.
NbO-type ceramics (where = Mg, Ca, Mn, Co, Ni, Zn and = Ti, Zr) are essential for satellite communication and mobile base stations due to their medium relative permittivity () and high quality factor ( × ). Although ZnTiZrNbO ceramic exhibits impressive microwave dielectric properties, including an of 29.75, a × of 107,303 GHz, and a of -24.
View Article and Find Full Text PDFSynthesis, structure, oxygen evolution reaction (OER) and visible-light assisted organic reaction studies on AMTeBO (A = Ba and Pb; M = Mg, Zn, Co, Ni, Cu, and Fe).
Dalton Trans
December 2024
Framework Solids Laboratory, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore - 560012, India.
Compounds with the general formula AMTeBO (A = Ba and Pb; M = Mg, Zn, Co, Ni, Cu, and Fe) have been synthesised solid-state techniques and characterised. The structure exhibits MBO layers connected by TeO octahedra giving rise to a three-dimensional structure with voids, where Ba ions reside. Substitution of Mg by transition elements (M = Co, Ni, and Cu) in BaMgTeBO and (BaPb)MgTeBO gives rise to interesting colored compounds.
View Article and Find Full Text PDFEffects of transition metal substitution doping on the structure and magnetic properties of biphenylene.
Phys Chem Chem Phys
December 2024
School of Physics and Electronic Engineering, LinYi University, LinYi 276000, China.
This study employed first-principles calculations to comprehensively explore the structural, electronic, and magnetic properties of transition metal-doped biphenylene networks (BPNs). Initially, we optimized the most stable structures of biphenylene doped with various transition metals (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn) and analysed their doping energies and electronic structures in detail. The results indicate that the introduction of transition metals induces varying degrees of spin polarization.
View Article and Find Full Text PDFEdge-substituents and center metal optimization boosting oxygen electrocatalysis in porphyrin-based covalent organic polymers.
J Colloid Interface Sci
February 2025
School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, PR China. Electronic address:
The promising non-noble electrocatalyst with well-defined structure is significant for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) for the renewable energy devices like zinc-air batteries (ZABs). Herein, the four phenyl-linked cobaltporphyrin-based covalent organic polymers (COPs-1-4) with the different edge substituents (1 = -tBu, 2 = -Me, 3 = -F, and 4 = -CF) are firstly designed and synthesized via a simple, efficient one-pot method. With the increase of electron donating capacity of the substituents, the highest occupied molecular orbital energy (E) gradually increases in the order of COP-4 < COP-3 < COP-2 < COP-1.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!