Institute of Solid State Physics

Janus materials provide an intrinsic platform for inversion-symmetry breaking and chirality-related phonon phenomena. Here, based on first-principles calculations, we investigate the impact of out-of-plane asymmetry on chiral phonons in Janus SbTeI. We show that exchanging the upper and lower atomic layers produces distinct chirality responses in different structural phases. In the 2H-phase, the phonon chirality in the in-plane directions is reversed while the out-of-plane component is preserved, whereas in the 1T-phase, all three chirality components are simultaneously flipped. We point out that the distinct responses are fundamentally determined by the mirror symmetry Mz and the spatial inversion symmetry P in different phases. Furthermore, these chirality reversals lead to corresponding changes in phonon angular momentum, magnetization under a temperature gradient, and the phonon Hall response in the presence of a magnetic field. Our findings highlight the essential role of Janus asymmetry in phonon chirality and related transport phenomena.

Nanocluster-stabilized sulfur-based superradical is reported by Zhikun Wu and co-workers in the Research Article (e17738). The superradical Au64(CPT)31S· was obtained through the homolytic cleavage of the thiolate S─C bond in the Au64(CPT)32 nanocluster precursor by radiative or solvent-induced methods. It can initiate the polymerization of pentaerythritol triacrylate in 3D printing despite its ultrastability. In addition, the superradical and its precursor exhibit NIR-II photoluminescence and high photothermal conversion efficiencies.

Abstract Recent experimental discoveries of infinite- and finite-layer nickelate superconductors have highlighted the importance of a single-band $${d}_{{x}^{2}-{y}^{2}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mrow> <mml:mi>d</mml:mi> </mml:mrow> <mml:mrow> <mml:msup> <mml:mrow> <mml:mi>x</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> <mml:mo>−</mml:mo> <mml:msup> <mml:mrow> <mml:mi>y</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:msub> </mml:math> Fermi surface for enabling unconventional superconductivity similar to cuprates. Motivated by this, we use density functional theory (DFT) and dynamical mean-field theory (DMFT) to identify two infinite-layer fluorides—KNiF 2 and KPdF 2 —as promising candidates. Both materials exhibit strong correlations, structural stability, a single-band $${d}_{{x}^{2}-{y}^{2}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mrow> <mml:mi>d</mml:mi> </mml:mrow> <mml:mrow> <mml:msup> <mml:mrow> <mml:mi>x</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> <mml:mo>−</mml:mo> <mml:msup> <mml:mrow> <mml:mi>y</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:msub> </mml:math> Fermi surface, and an antiferromagnetic Mott insulating state for the undoped parent compound. However, in KNiF 2 , overly strong correlations suppress spin fluctuations, preventing the electron pairing and superconducting states at finite temperatures. In contrast, KPdF 2 offers tunable superconducting behavior. Using dynamical vertex approximation (DΓA), we show that 20% hole doping on SrTiO 3 and 10% electron doping on MgO substrate yield superconducting transition temperatures of 65 K and 63 K, respectively, demonstrating the material’s potential through doping and substrate engineering.

ABSTRACT Tris{2''‐[3'‐(1,3‐dioxoisoindol‐2‐yl)propoxy]phenyl}phosphine oxide ( L ) has been synthesized. The complexes of ligand L with U(VI), Th(IV) have been isolated and studied in solid state and chloroform solution by elemental analysis, IR, Raman, NMR spectra, and x‐ray diffraction. Extraction properties of ligand L have been studied by the example of recovery of micro amounts of U(VI), Th(IV), and Ln(III) from 3 M NH 4 NO 3 solutions into chloroform. In crystalline complex [UO 2 L (H 2 O)(NO 3 ) 2 ], the ligand is coordinated by means of phosphoryl group, while one of the C═O groups forms hydrogen bond with coordinated water molecule. In the solid complex [Th 2 L 3 (H 2 O) 5 (NO 3 ) 8 ], phosphoryl groups of the ligands, nitrate anions, water molecules are coordinated, C═O groups form H‐bonds. The results of the solutions study have been compared with extraction data. In solution, the complexes are formed due to coordination of phosphoryl group and stabilized owing to hydrogen bonds of carbonyl groups. This stabilization improves extraction ability. According to extraction study, compound L exhibits significantly higher extraction ability toward U(VI) and Th(IV) compared to phosphine oxide Ph 3 P(O), (BuO) 3 PO, and Ph 2 P(O)CH 2 CONBu 2 . The UV–vis spectra showed that complexation of ligand L with UO 2 and Th nitrates does not affect considerably the character of absorption spectra.

Micro-sized porous Si with bimodal meso/micropores (µSPSi) is constructed via Al–Si melt modification. Owing to the synergistic stress-buffering effect of the hierarchical structure, the µSPSi@C anode delivers enhanced electrochemical performance.