General trend for pressurized superconducting hydrogen-dense materials
2010 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 107, no 7, 2793-2796 p.Article in journal (Refereed) Published
The long-standing prediction that hydrogen can assume a metallic state under high pressure, combined with arguments put forward more recently that this state might even be superconducting up to high temperatures, continues to spur tremendous research activities toward the experimental realization of metallic hydrogen. These efforts have however so far been impeded by the enormous challenges associated with the exceedingly large required pressure. Hydrogen-dense materials, of the MH4 form ( where M can be, e. g., Si, Ge, or Sn) or of the MH3 form ( with M being, e. g., Al, Sc, Y, or La), allow for the rather exciting opportunity to carry out a proxy study of metallic hydrogen and associated high-temperature superconductivity at pressures within the reach of current techniques. At least one experimental report indicates that a superconducting state might have been observed already in SiH4, and several theoretical studies have predicted superconductivity in pressurized hydrogen-rich materials; however, no systematic dependence on the applied pressure has yet been identified so far. In the present work, we have used first-principles methods in an attempt to predict the superconducting critical temperature (T-c) as a function of pressure ( P) for three metal-hydride systems of the MH3 form, namely ScH3, YH3, and LaH3. By comparing the obtained results, we are able to point out a general trend in the T-c-dependence on P. These gained insights presented here are likely to stimulate further theoretical studies of metallic phases of hydrogen-dense materials and should lead to new experimental investigations of their superconducting properties.
Place, publisher, year, edition, pages
2010. Vol. 107, no 7, 2793-2796 p.
ab initio calculations, high pressure, lattice dynamics, metal-hydride, superconductivity, gradient approximation, temperature, silane
IdentifiersURN: urn:nbn:se:kth:diva-19219DOI: 10.1073/pnas.0914462107ISI: 000274599500018ScopusID: 2-s2.0-77649297848OAI: oai:DiVA.org:kth-19219DiVA: diva2:337266
FunderSwedish Research Council
QC 201005252010-08-052010-08-052011-01-20Bibliographically approved