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JETP Letters

, Volume 89, Issue 4, pp 174–179 | Cite as

Evidence of maximum in the melting curve of hydrogen at megabar pressures

  • M. I. EremetsEmail author
  • I. A. Trojan
Open Access
Condensed Matter

Abstract

Hydrogen at high pressures of ∼400 GPa might be in a zero-temperature liquid ground state (N. Ashcroft, J. Phys.: Condens. Matter A 12, 129 (2000), E. G. Brovrnan et al., Sov. Phys. JETP 35, 783 (1972)). If metallic hydrogen is liquid, the melting T 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 melt = 1050 ± 60 K at P = 106 GPa and the melting temperature of hydrogen decreases at higher pressures so that T melt = 880 ± 50 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 481, 669 (2004)].

PACS numbers

62.50.-p 64.70.dj 67.63.Cd 67.80.ff 

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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  1. 1.Max Planck Institute für ChemieMainzGermany
  2. 2.Shubnikov Institute of CrystallographyRussian Academy of SciencesMoscowRussia

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