Lead-free iron-doped CsBiBr perovskite with tunable properties.

Perovskite based on cesium bismuth bromide offers a compelling, non-toxic alternative to lead-containing counterparts in optoelectronic applications. However, its widespread usage is hindered by its wide bandgap. This study investigates a significant bandgap tunability achieved by introducing Fe doping into the inorganic, lead-free, non-toxic, and stable CsBiBr perovskite at varying concentrations.

Structural Characterization of Graphite Analogue BC Synthesized Under Various Conditions and Its Application to Ti Intercalation.

A graphite-like material boron carbide (BC) was synthesized under various heat treatment conditions and extensively characterized. First, we synthesized the BC precursor phase by a single-step reaction using a mixed solution of BBr and CH. We confirmed that the precursor phase had a graphite-like structure with B-C chemical bonds, but its crystallinity was poor.

Origin of Unexpected Ir in a Superconducting Candidate SrIrO System Analyzed by Photoelectron Holography.

The reason for the absence of superconductivity in SrIrO was estimated by photoelectron spectra and photoelectron holograms. The analysis of the La photoelectron hologram concluded that La atoms are substituted to Sr sites. Two O 1s peaks were observed and were identified as the oxygens in the IrO and SrO planes by photoelectron holography and density functional theory (DFT) calculations.

Superconducting behavior of a new metal iridate compound, SrIr, under pressure.

Herein, we investigated the pressure dependence of electric transport in a new type of superconducting metal iridate compound, SrIr, that exhibits a superconducting transition temperature, T , as high as 6.6 K at ambient pressure, in order to complete the T -pressure (p ) phase diagram. Very recently, this sample's superconductivity was discovered by our group, but the superconducting behavior has not yet been clarified under pressure.

Determination of the local structure of SrMIrO (M = K, La) as a function of doping and temperature.

The local structure of correlated spin-orbit insulator Sr2-xMxIrO4 (M = K, La) has been investigated by Ir L3-edge extended X-ray absorption fine structure measurements. The measurements were performed as a function of temperature for different dopings induced by substitution of Sr with La or K. It is found that Ir-O bonds have strong covalency and they hardly show any change across the Néel temperature.

Suppression of magnetic coupling by in-plane buckling in SrFeO2.

SrFeO2 is an insulating antiferromagnet with a remarkably high transition temperature in spite of its quasi-two-dimensional crystal structure. The magnetic exchange coupling is, however, very sensitive to a local mode involving transverse displacements of O and Fe, resulting in zigzag patterns of distortion. The buckling driven by rising temperatures is enhanced just as the Fe magnetic moment is reduced, implying a strong spin-lattice coupling.