Pressure-temperature phase diagram of the organic Mott insulator $\kappa$-(ET)$_2$Cu$_2$(CN)$_3$, a model system spin liquid on triangular lattice, has been investigated by $^1$H NMR and resistivity measurements. The spin-liquid is persistent before transition to metal or superconducting under pressure. At transition, fluctuations are rapidly suppressed Fermi-liquid features observed in temperature dependence spin-lattice relaxation rate resistivity. characteristic curvature boundary...

$(\mathrm{TMTSF}{)}_{2}{\mathrm{ClO}}_{4}$ is a quasi-one-dimensional organic conductor and superconductor with ${T}_{c}=1.4\text{ }\text{ }\mathrm{K}$, one of at least two Bechgaard salts observed to have upper critical fields far exceeding the paramagnetic limit. Nevertheless, $^{77}\mathrm{Se}$ NMR Knight shift low reveals decrease in spin susceptibility ${\ensuremath{\chi}}_{s}$ consistent singlet pairing. The field dependence spin-lattice relaxation rate 100 mK exhibits sharp crossover...

We systematically investigated the electronic structure of full-Heusler alloys with valence electron counts per formula unit 24 by using first-principles calculation. found various semiconducting flat bands at bottom conduction band. In terms low toxicity and cost, we focused on Fe2TiSn Fe2TiSi. that they could possess high thermoelectric power ranging from -300 to -160 µV/K electron-carrier concentrations 1×1020 1×1021 cm-3 around room temperature. Our results also suggest Fe2TiSn1-xSix...

We employ antiferromagnetic tunneling anisotropic magnetoresistance to study the behavior of antiferromagnetically ordered moments in IrMn exchange coupled NiFe. Experiments performed by common laboratory tools for magnetization and electrical transport measurements allow us directly link broadening NiFe hysteresis loop its shift (exchange bias) rotation pinning IrMn. At higher temperatures, broadened loops show zero shift, which correlates with observation fully rotating inside film. The...

The Mott metal-insulator transition-a manifestation of Coulomb interactions among electrons-is known as a discontinuous transition. Recent theoretical studies, however, suggest that the transition is continuous if insulator carries spin liquid with spinon Fermi surface. Here, we demonstrate case quasi-continuous from to in an organic triangular-lattice system κ-(ET)2Cu2(CN)3. Transport experiments performed under fine pressure tuning have found approached, coherence temperature continuously...

Abstract The gas-phase etching of SiO 2 was examined using HF and methanol vapor at temperatures below 0 °C low pressure. rate increased with decreasing temperature showed a maximum around –30 °C. obtained 40 nm min −1 plasma-enhanced chemical deposition . SiN for comparison more than ten times smaller that under the same condition. As result, selectivity to found be over 20 –40 When utilizing less °C, showing high achieved.

We investigated the magnetism under a magnetic field in quasi-two-dimensional organic Mott insulator $\ensuremath{\kappa}\text{\ensuremath{-}}{(\text{BEDT-TTF})}_{2}\text{Cu}[\text{N}{(\text{CN})}_{2}]\text{Cl}$ through magnetization and $^{13}\text{C}\text{-NMR}$ measurements. found that nominally paramagnetic phase (i.e., above N\'eel temperature) field-induced local moments have staggered component perpendicular to applied field. As result, antiferromagnetic transition well defined at...

We demonstrate the improved power factor in full-Heusler Fe2VAl1−xSix thin films using precise composition-control with off-axis sputtering method. The valence electron concentration per atom was varied from 5.9 to 6.1 by manipulating target substrate distance addition changing composition, resulting an up 3.0 mW/K2 m off-stoichiometric composition of Fe1.93V1.05Al0.77Si0.24. had a polycrystalline structure average grain size 40–50 nm. cumulative lattice thermal conductivity calculation as...

Thermoelectric properties of a semiconducting silicide, $\mathrm{C}{\mathrm{a}}_{3}\mathrm{S}{\mathrm{i}}_{4}$, were investigated by first-principles calculations. The calculation results revealed that $\mathrm{C}{\mathrm{a}}_{3}\mathrm{S}{\mathrm{i}}_{4}$ has relatively low lattice thermal conductivity around $1.2\phantom{\rule{0.16em}{0ex}}\mathrm{W}{\mathrm{m}}^{\ensuremath{-}1}{\mathrm{K}}^{\ensuremath{-}1}$ at 800 K. Seebeck coefficients and the electrical conductivities evaluated using...

We investigate the thickness and temperature dependence of a series Ni0:8Fe0:2/Ir0:2Mn0:8 bilayer samples with varying ratio ferromagnet/antiferromagnet (tFM/tAFM) in order to explore exchange coupling strengths tunneling anisotropic magnetoresistance (TAMR) devices. Specific values tFM/tAFM lead four distinct scenarios specific electric responses moderate magnetic fields. The characteristic measured TAMR signal on applied voltage allows us confirm its persistence up room despite an...

Thermal boundary resistance (TBR) was controlled by changing the Ge ratio in a MnSi1.7-based nanocomposite with SiGe to investigate effects of TBR on thermal transport. We demonstrated continuous reduction conductivity down 1.2 W/Km, which is less than minimum MnSi1.7, even granular structures: practical forms thermoelectric (TE) technologies. The between MnSi1.7 and estimated quantitatively multilayered structures be as high 5.6 × 10−9 m2 K/W detailed analysis suggests that 20%–30%...

We have investigated the origin of large increase in spin-echo decay rates for $^{77}$Se nuclear spins at temperatures near to $T=30K$ organic superconductor (TMTSF)$_2$ClO$_4$. The measured angular dependence $T_2^{-1}$ demonstrates that source decays lies with carrier density fluctuations rather than TMTSF molecular orientation. very long time scales are directly associated dynamics anion ordering occurring $T=25K$, and inhomogeneously broadened spectra lower result from finite domain...

In this study, various Fe-based thermoelectric full-Heusler thin films were fabricated on MgO substrates by a post-annealing process. It is clarified that crystal growth through the process prevented both an initial crystallization and lattice mismatch between substrate. One of materials, namely, Fe2TiAl, was almost epitaxially grown substrate from amorphous state owing to small less than 3%. The properties Fe2TiAl-based modulated changing material composition. We found they strongly depend...

Abstract Fe 2 TiSi full-Heusler thin films were synthesized with a homogeneous single-phase structure and the composition was controlled in wide range by deposition techniques. By detailed tuning of film composition, Seebeck coefficient reached −184 μ V K −1 , which is almost maximum for alloys, power factor 3.9 mW −2 m . The thermal conductivity 3.5 W first-principles calculations clarified that this small value may be due to alloy scatterings. Consequently, ZT 0.36 at room temperature...

$(TMTSF)_2ClO_4$ is a quasi-one dimensional organic conductor and superconductor with $T_c=1.4$K, one of at least two Bechgaard salts observed to have upper critical fields far exceeding the paramagnetic limit. Nevertheless, $^{77}$Se NMR Knight shift low reveals decrease in spin susceptibility $\chi_s$ consistent singlet pairing. The field dependence spin-lattice relaxation rate 100mK exhibits sharp crossover (or phase transition) $H_s\sim15$kOe, regime where close normal state value, even...

We report a lowered lattice thermal conductivity in nm-scale MnSi1.7/Si multilayers which were fabricated by controlling diffusions of Mn and Si atoms. The thickness the constituent layers is 1.5–5.0 nm, comparable to phonon mean free path both MnSi1.7 Si. By applying above nanostructures, we reduced down half that bulk composite materials. obtained value 1.0 W/K m experimentally observed minimum MnSi1.7-based materials without any heavy element doping close conductivity. attribute...

We calculated electron-phonon coupling factors and lattice thermal conductivity of FCC metals L12 type binary alloys (X3Y: X,Y = Cu, Ag, Au, Pt, Pd) by using first-principles calculations. The Ag- Au-based are much lower than that Pd- Pt-based because the low density states around Fermi level alloys. conductivities Pd-, other their heavy atomic mass Au force constants. also evaluated interfacial resistance a metal/insulator bilayer originated from non-equilibrium state between electrons...

Thermoelectric properties of composite thin films with higher manganese silicide (MnSi1.7) and silicon (Si) were investigated together textures crystal structures. The MnSi1.7-based fabricated from multilayers by post annealing using planar coupling reactions in the interfaces between layers. Moreover, to improve morphology films, layer thicknesses changed. As a consequence, smooth voidless consisting crystallized MnSi1.7 successfully obtained solid-phase when thickness was less than 2 nm....