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This article is cited in 3 scientific papers (total in 3 papers)
CONDENSED MATTER
Thermopower of calcium at high pressures
V. V. Brazhkin, O. B. Tsiok, M. V. Magnitskaya Institute for High Pressure Physics, Russian Academy of Sciences
Abstract:
Calcium at megabar pressures undergoes numerous structural transitions and has a complex phase diagram. At the same time, according to the recent theoretical investigations, an anomalous behavior of many physical properties, including a transition to the state of a narrow-gap semiconductor, can be expected even in the region of stability of the normal-pressure phase of calcium with the fcc structure at moderate pressures$P\sim(5$–$15)\,$GPa. Data on the thermopower of calcium in the pressure range up to $9$ GPa have been reported. The thermopower in this pressure range is positive, has a smooth maximum at $5$–$6$ GPa, and decreases quite rapidly at higher pressures. The absolute values of the thermopower ($5$–$12$ мV/K) indicate that calcium in this pressure range is a metal. The difference between the thermopowers in the direct and inverse passages in the range of $5$–$7.5$ GPa is fairly noticeable (${\approx}\,10\%$). The possible reasons for such an anomalous behavior, as well as new calculations of the band structure of calcium, have been discussed.
Received: 01.03.2013 Revised: 22.03.2013
Citation:
V. V. Brazhkin, O. B. Tsiok, M. V. Magnitskaya, “Thermopower of calcium at high pressures”, Pis'ma v Zh. Èksper. Teoret. Fiz., 97:8 (2013), 561–565; JETP Letters, 97:8 (2013), 490–494
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https://www.mathnet.ru/eng/jetpl3409 https://www.mathnet.ru/eng/jetpl/v97/i8/p561
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Abstract page: | 222 | Full-text PDF : | 56 | References: | 28 | First page: | 8 |
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