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Strain-dependent structural, electronic, mechanical, optical and thermoelectric properties of SrNBr perovskites for solar cell applications.
Phys Chem Chem Phys
January 2025
Department of Physics, Riphah International University, Islamabad 44000, Pakistan.
Halide perovskites are a class of materials with excellent potential for solar cell applications due to their excellent optical and electronic properties. In this study, strain-dependent physical properties of SrNBr perovskites are investigated and theoretical results are reported here. The structural properties indicate that SrNBr has a cubic structure.
View Article and Find Full Text PDFAnisotropic atomic displacements, local orthorhombicity and anomalous local magnetic moment in BaKFeAs superconductor.
Phys Chem Chem Phys
August 2024
Dipartimento di Fisica, Universitá di Roma "La Sapienza" - P. le Aldo Moro 2, 00185 Roma, Italy.
We have investigated the in-plane local structure of the BaKFeAs superconductor by polarized Fe K-edge extended X-ray absorption fine structure (EXAFS) measurements with temperature. The near neighbor bond distances and their stiffness, measured by polarized EXAFS in two orthogonal directions, are different suggesting in-plane anisotropy of the atomic displacements and local orthorhombicity in the title system. The X-ray absorption near edge structure (XANES) spectra reveal anisotropy of valence electronic structure that changes anomalously below ∼100 K.
View Article and Find Full Text PDFSuperconductivity of Co-Doped CaKFeAs Investigated via Point-Contact Spectroscopy and London Penetration Depth Measurements.
Nanomaterials (Basel)
August 2024
Department of Applied Science and Technology, Politecnico di Torino, I-10129 Torino, Italy.
The iron-based superconductors (IBSs) of the recently discovered 1144 class, unlike many other IBSs, display superconductivity in their stoichiometric form and are intrinsically hole doped. The effects of chemical substitutions with electron donors are thus particularly interesting to investigate. Here, we study the effect of Co substitution in the Fe site of CaKFe4As4 single crystals on the critical temperature, on the energy gaps, and on the superfluid density by using transport, point-contact Andreev-reflection spectroscopy (PCARS), and London penetration depth measurements.
View Article and Find Full Text PDFEffects of Planarization of the Triphenylamine Unit on the Electronic and Transport Properties of Triarylamine-Fluorene Copolymers in Both Doped and Undoped Forms.
ACS Appl Mater Interfaces
July 2024
Department of Chemistry, National University of Singapore, Lower Kent Ridge Road, S117552 Singapore.
Article Synopsis
- Triarylamine–fluorene (TAF) copolymers, previously under-researched for planarization, have been shown to enhance electronic and transport properties when compared to their conventional twisted variants.
- Planarization results in trap-free hole transport and increased mobility, particularly in undoped states, while also slightly reducing the ionization energy and adjusting the work function.
- The study further reveals new behaviors in TAF polymers, including the formation of polaron bands upon doping and a peak in electrical conductivity at a specific doping level, which supports their effective use in organic semiconductor diodes as hole injection layers.
Cuprate-like electronic structures in infinite-layer nickelates with substantial hole dopings.
Natl Sci Rev
August 2024
National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China.
Article Synopsis
- Superconducting infinite-layer nickelates present a unique opportunity to explore high-temperature superconductivity, with ongoing debates regarding their electronic mechanics due to complex structures.
- Recent advancements in angle-resolved photoemission spectroscopy allowed researchers to directly study the electronic structures of both the parent compound LaNiO and the superconducting LaCaNiO.
- Findings reveal distinct Fermi surfaces and band structures that resemble those of cuprate superconductors, but with notable differences in hole doping between the two, shedding light on the superconducting mechanisms of nickelates.
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