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- W2072553536 abstract "It has been suggested that Yb and Sr undergo semimetal-to-semiconductor transitions under pressure. We have measured the electrical resistivity $ensuremath{rho}$ from 298 to 2ifmmode^circelsetextdegreefi{}K at different pressures up to 50 kbar. In Yb, $ensuremath{rho}$ at 4.2ifmmode^circelsetextdegreefi{}K increases by a factor of 6ifmmodetimeselsetexttimesfi{}${10}^{4}$ at $P=25$ kbar and saturates at higher pressures. For $P<25$ kbar, we find the empirical relation at 4.2ifmmode^circelsetextdegreefi{}K $mathrm{ln}[frac{ensuremath{rho}(P)}{ensuremath{rho}(1 mathrm{atm})}]=0.45 P$, where $P$ is the pressure in kbar. At $P=25$ kbar, the resistance ratio $frac{ensuremath{rho}({4.2}^{ensuremath{circ}}mathrm{K})}{ensuremath{rho}({298}^{ensuremath{circ}}mathrm{K})}=220$. In Sr the resistance rise is much less dramatic, $ensuremath{rho}$ at 4.2ifmmode^circelsetextdegreefi{}K increasing by a factor of 50 in 35 kbar. A small negative temperature coefficient of resistivity appears for $Pensuremath{gtrsim}30$ kbar in Sr. We suggest that Yb becomes a semiconductor at high pressures, whereas Sr remains a semimetal. These conclusions are compatible with the band-structure calculations of Vasvari, Animalu, and Heine for the fcc alkaline-earth metals, if the effects of spin-orbit coupling are included. We find no evidence for either an excitonic phase or a first-order transition in the neighborhood of the semimetal-to-semiconductor transition at low temperatures. However, no definitive statements can be made because of impurity effects. The Yb sample was 99.99% pure according to emission-spectrographic analysis. At higher pressures both Yb and Sr showed the transition to the bcc phase, and in this phase both materials behaved as a good metal and showed no evidence of a magnetic transition." @default.
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- W2072553536 date "1969-01-15" @default.
- W2072553536 modified "2023-09-26" @default.
- W2072553536 title "Metal-Semiconductor Transition in Ytterbium and Strontium at High Pressure" @default.
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- W2072553536 doi "https://doi.org/10.1103/physrev.177.1063" @default.
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