1,241 research outputs found
Syntheses of 18F-5-Fluorouracil, 18F-Fluorouridine and 18F-5-Fluoro-2\u27-deoxyuridine
開始ページ、終了ページ: 冊子体のページ付
Increased Amounts of D-Enantiomer Dependent on Alkaline Concentration in the Synthesis of L-[methyl-11C] Methionine
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Determination of Ascorbic Acid in ODS Rat Brain and Plasma
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Critical enhancement of thermopower in a chemically tuned polar semimetal MoTe
Ferroelectrics with spontaneous electric polarization play an essential role
in today's device engineering, such as capacitors and memories. Their physical
properties are further enriched by suppressing the long-range polar order, as
is exemplified by quantum paraelectrics with giant piezoelectric and dielectric
responses at low temperatures. Likewise in metals, a polar lattice distortion
has been theoretically predicted to give rise to various unusual physical
properties. So far, however, a "ferroelectric"-like transition in metals has
seldom been controlled and hence its possible impacts on transport phenomena
remain unexplored. Here we report the discovery of anomalous enhancement of
thermopower near the critical region between the polar and nonpolar metallic
phases in 1T'-MoNbTe with a chemically tunable polar
transition. It is unveiled from the first-principles calculations and
magnetotransport measurements that charge transport with strongly
energy-dependent scattering rate critically evolves towards the boundary to the
nonpolar phase, resulting in large cryogenic thermopower. Such a significant
influence of the structural instability on transport phenomena might arise from
the fluctuating or heterogeneous polar metallic states, which would pave a
novel route to improving thermoelectric efficiency.Comment: 26 pages, 4 figure
Efficiency of Grain Production in 18F Micro-Autoradiography
開始ページ、終了ページ: 冊子体のページ付
Metabolism of Vanadiuim-48 in Mice
開始ページ、終了ページ: 冊子体のページ付
Automated Synthesis of [18F]-Methyl Fluoride
開始ページ、終了ページ: 冊子体のページ付
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