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Mettalic Hydrogene

#0207


Theoretical Investigation of Production Possibility of Metallic Hydrogen and its Physical Properties at Low Temperatures

Tech Area / Field

  • PHY-SSP/Solid State Physics/Physics

Status
8 Project completed

Registration date
25.07.1994

Completion date
23.08.2003

Senior Project Manager
Zykov S A

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Supporting institutes

  • FIAN Lebedev, Russia, Moscow

Collaborators

  • Max Plank Institute of Solid State Physics, Germany, Stuttgart\nEcole Normale Supérieure / Laboratoire de Physique Statistique, France, Paris

Project summary

The goal of this project is to solve a number of theoretical problems in condensed matter science, related to production of various modifications of the same substances at varying external parameters, in particular, at high pressure and low temperature. Most attention will be concentrated on phase transitions in crystalline hydrogen, the possibility of hydrogen metallization and its transition into a superconducting state will be especially considered. In addition, the relevant problem of electron-phonon interaction (EPI) and related to it superconducting and kinetic properties of metals.

Along with comprehensive research of such phenomena as metallization and superconductivity in the case of solid hydrogen, some other interesting in this respect systems are supposed to be considered, the high-temperature superconductors among them.

In connection with creation of novel materials which is an important technological problem, many world research centers in developed countries such as USA, Germany, Japan etc., are now studying similar problems.

In this proposal the following objectives are pursued:


- to investigate the kinetics of the phase transformation of molecular hydrogen to an atomic crystalline phase and its possible metallization;
- to study the dynamical stability of various crystalline phases, as well as EPI and the superconductivity in metallic hydrogen;
- to perform the ab initio calculations of EPI and the critical temperature of superconducting transition in metals, including high-temperature superconductors.

In order to describe the new phase nucleation, the method of subbarrier movement trajectories will be implemented. This method, developed by the project participants from Russian Federal Nuclear Center - VNIIEF, shows considerable promise as a means for taking into account the influence of dissipation processes on the kinetics of the molecular hydrogen transition into an atomic crystalline state.

First-principles methods for calculating the properties of solids are also to be used. They have been elaborated by the project participants from P.N.Lebedev Physical Institute (LPI) and the group from Max Planck Institute for Solid State Research in Stuttgart, Germany. In particular, an original technique, more recently developed by these two groups on the basis of the linear response theory, is supposed to be implemented in calculating dynamical matrix of lattice vibrations and the EPI matrix elements.

Expected results:


- creation of the detailed kinetic theory for describing the dynamics of phase transformations at low temperatures;
- study of the phase transition of molecular hydrogen to an atomic crystalline state and its metallization;
- determination of dynamically stable phases of crystalline hydrogen;
- estimation of the critical temperature of superconducting transition in metallic hydrogen;
- elaboration of efficient computer codes for calculating the physical properties of solids;
- explanation on the basis on ab initio calculations, how EPI and the critical temperature of superconducting transition depend on the crystal structure type;
- estimation of EPI in high-temperature superconductors.

The participation in basic research together with the LPI team that has widespread international relations, will enable the VNIIEF scientists, previously involved in development of nuclear weapons, to turn to a peaceful creative activity and join the world scientific community.


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