Stoichiometric Ternary Superhydride LaBeH_{8} as a New Template for High-Temperature Superconductivity at 110 K under 80 GPa.

The search for high-temperature superconducting superhydrides has recently moved into a new phase by going beyond extensively probed binary compounds and focusing on ternary ones with vastly expanded material types and configurations for property optimization. Theoretical and experimental works have revealed promising ternary compounds that superconduct at or above room temperature, but it remains a pressing challenge to synthesize stoichiometric ternary compounds with a well-resolved crystal structure that can host high-temperature superconductivity at submegabar pressures. Here, we report on the successful synthesis of ternary LaBeH_{8} obtained via compression in a diamond anvil cell under 110-130 GPa.

Giant enhancement of superconducting critical temperature in substitutional alloy (La,Ce)H.

A sharp focus of current research on superconducting superhydrides is to raise their critical temperature T at moderate pressures. Here, we report a discovery of giant enhancement of T in CeH obtained via random substitution of half Ce by La, leading to equal-atomic (La,Ce)H alloy stabilized by maximum configurational entropy, containing the LaH unit that is unstable in pure compound form. The synthesized (La,Ce)H alloy exhibits T of 148-178 K in the pressure range of 97-172 GPa, representing up to 80% enhancement of T compared to pure CeH and showcasing the highest T at sub-megabar pressure among the known superhydrides.

Effect of Magnetic Impurities on Superconductivity in LaH.

Polyhydrides are a novel class of superconducting materials with extremely high critical parameters, which is very promising for sensor applications. On the other hand, a complete experimental study of the best so far known superconductor, lanthanum superhydride LaH , encounters a serious complication because of the large upper critical magnetic field H (0), exceeding 120-160 T. It is found that partial replacement of La atoms by magnetic Nd atoms results in significant suppression of superconductivity in LaH : each at% of Nd causes a decrease in T by 10-11 K, helping to control the critical parameters of this compound.

Quantification of Eccentric Fixation Using Spectral-Domain Optical Coherence Tomography.

Purpose: This study aimed to evaluate the utility of optical coherence tomography (OCT) in the quantification of eccentric fixation in amblyopic patients.

Material And Methods: In this study, 14 amblyopic patients and 10 healthy volunteers were enrolled. Under non-mydriatic conditions, fixation tests were performed directly using a fixation ophthalmoscope and indirectly using spectral-domain OCT.

Emergence of double-dome superconductivity in ammoniated metal-doped FeSe.

The pressure dependence of the superconducting transition temperature (Tc) and unit cell metrics of tetragonal (NH3)yCs0.4FeSe were investigated in high pressures up to 41 GPa. The Tc decreases with increasing pressure up to 13 GPa, which can be clearly correlated with the pressure dependence of c (or FeSe layer spacing).

Ca-VII: a chain ordered host-guest structure of calcium above 210 GPa.

The recently discovered high pressure phase VII of calcium [M. Sakata et al., Phys.

Comparative study of FDG PET/CT and conventional imaging in the staging of rhabdomyosarcoma.

Objective: The current study was conducted to compare the diagnostic accuracy between (18)F-fluoro-2-deoxy-D: -glucose (FDG) positron emission tomography (PET)/computed tomography (CT), and conventional imaging (CI) for the staging and re-staging of patients with rhabdomyosarcomas.

Methods: Thirty-five patients who underwent FDG PET/CT prior to treatment were evaluated retrospectively. CI methods consisted of (99m)Tc-hydroxymethylene diphosphonate bone scintigraphy, chest radiograph, whole body CT, and magnetic resonance imaging of the primary site.

Crystal structures of calcium IV and V under high pressure.

High-pressure phases IV and V of calcium discovered in 2005 have the highest superconducting transition temperature of 25 K among all the elements; however, their crystal structures have not been determined. From the x-ray powder diffraction data, both Ca IV and V have been found to form unique and complex structures with a coordination number of 7. They were confirmed to be identical to the theoretical models that were recently predicted [Ishikawa, Phys.