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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2009, Volume 89, Issue 4, Pages 198–203
(Mi jetpl362)
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This article is cited in 75 scientific papers (total in 75 papers)
CONDENSED MATTER
Evidence of maximum in the melting curve of hydrogen at megabar pressures
M. I. Eremetsa, I. A. Trojanba a Max Planck Institute for Chemistry
b Institute of Cristallography RAS
Abstract:
Hydrogen at high pressures of $\sim\,400\,$GPa might be in a zero-temperature liquid ground state (N. Ashcroft, J. Phys. Condens. Matter {A \bf12}, 129 (2000), E. G. Brovman et al., Sov. Phys. JETP 35, 783 (1972)). If metallic hydrogen is liquid, the melting $T_{\rm melt}$(P) line should possess a maximum. Here we report on the experimental evaluation of the melting curve of hydrogen in the megabar pressure range. The melting curve of hydrogen has been shown to reach a maximum with $T_{\rm melt}=1050\pm60\,$K at $P=106\,$GPa and the melting temperature of hydrogen decreases at higher pressures so that $T_{\rm melt}=880\pm50\,$K at $P=146\,$GPa. The data were acquired with the aid of a laser heating technique where diamond anvils were not deteriorated by the hot hydrogen. Our experimental observations are in agreement with the theoretical prediction of unusual behavior of the melted hydrogen [S. Bonev et al., Nature 431, 669 (2004)].
Received: 18.12.2008
Citation:
M. I. Eremets, I. A. Trojan, “Evidence of maximum in the melting curve of hydrogen at megabar pressures”, Pis'ma v Zh. Èksper. Teoret. Fiz., 89:4 (2009), 198–203; JETP Letters, 89:4 (2009), 174–179
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https://www.mathnet.ru/eng/jetpl362 https://www.mathnet.ru/eng/jetpl/v89/i4/p198
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Abstract page: | 437 | Full-text PDF : | 91 | References: | 43 |
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