The elastic properties of a filled skutterudite ${\mathrm{PrOs}}_{4}{\mathrm{Sb}}_{12}$ with heavy fermion superconductivity at ${T}_{\mathrm{C}}=1.85\mathrm{K}$ have been investigated. softening ${(C}_{11}\ensuremath{-}{C}_{12})/2$ and ${C}_{44}$ lowering temperature down to ${T}_{\mathrm{C}}$ indicates that the quadrupolar fluctuation due CEF state plays role for Cooper paring in superconducting phase ${\mathrm{PrOs}}_{4}{\mathrm{Sb}}_{12}.$ A Debye-type dispersion constants around 30 K...

We have synthesized off-stoichiometric Ti-Ni-Sn half-Heusler thermoelectrics in order to investigate the relation between randomly distributed defects and thermoelectric properties. A small change composition of causes a remarkable thermal conductivity. An excess content Ni realizes low conductivity 2.93 W/mK at room temperature while keeping high power factor. The originates generated by an Ni. To detailed defect structure, we performed first-principles calculations compared with x ray...

In Cu2ZnSnS4 (CZTS) photovoltaic cells, a low open-circuit voltage (VOC) principally causes conversion efficiency. We investigated the deposition of CZTS layer by two-layer process to improve VOC cells. this process, first layers near Mo electrode have high Cu content and second surface has content. The improved cells from 0.66 0.78 V. Finally, best cell showed efficiency 8.8%.

We directly and non-destructively measured the valence band offset at interface between CdS Cu2ZnSnS4 (CZTS) using hard X-ray photoelectron spectroscopy (HAXPES), which can measure electron state of buried because its large analysis depth. These measurements were made following real devices; CZTS(t = 700 nm), CdS(t 100 nm)/CZTS(t 5 nm) films formed on Mo coated glass. The spectra by HAXPES an photon energy 8 keV. value CZTS was estimated as 1.0 eV fitting spectra. conduction could be deduced...

Elastic properties of the perovskite manganite ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}(x=0.12,0.165,0.3)$ with both orbital and charge degrees freedom have been investigated by means ultrasonic measurements. Above structural phase transition point ${T}_{s}=290\mathrm{K}$ for $x=0.12$ ${T}_{s}=310\mathrm{K}$ $x=0.165,$ transverse ${(C}_{11}\ensuremath{-}{C}_{12})/2$ mode elastic strain ${E}_{g}$ symmetry exhibits a pronounced softening, while ${C}_{44}$ ${T}_{2g}$...

We have performed first-principles calculations for the $\mathrm{Ag}{\mathrm{Pb}}_{m}\mathrm{Sb}{\mathrm{Te}}_{2+m}$ ($m=6$, 14, and 30) to clarify effect of simultaneous doping Ag Sb on PbTe. The atomic positions were optimized model structures with $m=6$, 30. calculated formation energy lattice constant by varying distance between atoms in each structure revealed that Ag-Sb pair is stabilized when it forms nearest neighbor PbTe matrix, which consistent recently reported experimental data....

We have made ultrasonic measurements of ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(x=0.35,$0.40,0.50) with the colossal magnetoresistance in order to investigate lattice effects due orbital and charge degrees freedom systems. As a result, we observe three types elastic softening. The first one is softening ${(C}_{11}\ensuremath{-}{C}_{12})/2$ $x=0.35,$ 0.40, 0.50 compounds above charge-ordering point ${T}_{\mathrm{co}},$ which originates from interaction...

By using the first principle band calculations, we identified that Si2Ti-type Al-Mn-Si C54-phase possesses an electronic structure suitable for thermoelectric materials. The formation range of was determined by preparing samples at a number different compositions, and solely consisting were successfully obtained around Al:Mn:Si=1:1:1. carrier concentration controlled partial substitution constituent elements, behaviors in electrical properties characteristic to n-type p-type materials...

It is now well recognized that we are witnessing a golden age of innovation with novel materials, discoveries important for both basic science and industry. With the development theory along computing power, quantum materials design—the synthesis desired properties in controlled way via engineering on atomic scale—is becoming major component research. Computational prediction based first-principles calculations has helped to find an efficient develop much needed industry, as have seen...

The performance of the planar magnetron sputtering apparatus with use a c-axis oriented single-domain Sm123 bulk superconductor 60 mm in diameter is discussed. A high magnetic field 4.2 T at surface coupled electric maximum 6 kV enabled us to discharge even Ar gas pressure 1 × 10−3 Pa. target-to-substrate distance could be extended 30 under low pressures 10−2–10−3 Pa allow deposition an incidence angle normal substrate. discharging characteristics Cu, Ni, Fe, Al and carbon targets range over...

A magnetized c-axis oriented single-domain Sm123 bulk superconductor of 60 mm in diameter was employed place a conventional Nd–Fe–B permanent magnet planar-type magnetron sputtering apparatus and its performance studied by measuring the Ar gas pressure dependence deposition rate for elemental targets Cu, Ni, Fe, C Al different thicknesses. The value on surface Cu target 3 thickness reached 0.63 T comparison with 0.05 sputtering. use such high enabled us to carry out down extremely low 1 ×...

In Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ZnSnS xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> (CZTS) photovoltaic cells, a low open-circuit voltage (V xmlns:xlink="http://www.w3.org/1999/xlink">OC</sub> ) principally causes the conversion efficiency. We investigated deposition of CZTS layer using two-layered process to improve V cells. this process, first layers near Mo electrode was composed high content and second...

High-throughput experiments including combinatorial chemistry are useful for generating large amounts of data within a short period time. Machine learning can be used to predict the regularity response variable using statistical model set. Because combination these methods accelerate material development, we applied such search semiconducting thin films prepared on an Eu and Dy codoped SrAl2O4-based phosphorescent improve lifetime its afterglow. Oxide targets MgO, GeO2, Ga2O3, ZnO, Bi2O3,...

Abstract Although individual Li‐intercalated metal–organic frameworks (iMOFs) exhibit properties that make them suitable for use as electrodes in Li‐ion batteries, none of these materials have the ideal combination electrochemical characteristics. Using high specific capacity and low polarization 2,6‐naphthalene dicarboxylate dilithium a basis improvement, 26 iMOFs from different combinations aqueous terephthalic, dicarboxylic, 4,4′‐biphenyl dicarboxylic‐based solutions with Li source are...

We have investigated the bottom coverage effect of circular vias with different aspect ratios patterned on Si substrates by depositing Cu using a magnetron sputtering apparatus equipped superconducting bulk magnet. The SmBa 2 3 O 7-δ 60 mm diameter was magnetized up to 4.5 T at 52 K and cooled 40 in refrigerator. It served as permanent magnet producing magnetic fields about 10 times strong that obtained from conventional Nd–Fe–B magnet, resulting marked enhancement plasma density target....

Elastic properties have been investigated on the skutterudite compounds: PrFe 4 P 12 , NdFe and CeRu Sb . A pronounced softening behavior towards low temperatures was observed in elastic constants of zero field. On other hand, it not either compounds However, a remarkable c 11 appeared applying magnetic fields. All these behaviors will be discussed terms effect due to crystalline electric field (CEF) split levels ground-state J multiplet.