Critical temperature of metallic hydrogen sulfide at 225-GPa pressure

Journal Article · Sun Jan 15 00:00:00 EST 2017 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776116150103· OSTI ID:22617086

Kudryashov, N. A.; Kutukov, A. A.

The Eliashberg theory generalized for electron—phonon systems with a nonconstant density of electron states and with allowance made for the frequency behavior of the electron mass and chemical potential renormalizations is used to study T{sub c} in the SH{sub 3} phase of hydrogen sulfide under pressure. The phonon contribution to the anomalous electron Green’s function is considered. The pairing within the total width of the electron band and not only in a narrow layer near the Fermi surface is taken into account. The frequency and temperature dependences of the complex mass renormalization ReZ(ω), the density of states N(ε) renormalized by the electron—phonon interactions, and the electron—phonon spectral function obtained computationally are used to calculate the anomalous electron Green’s function. A generalized Eliashberg equation with a variable density of electron states has been solved. The frequency dependence of the real and imaginary parts of the order parameter in the SH{sub 3} phase has been obtained. The value of T{sub c} ≈ 177 K in the SH{sub 3} phase of hydrogen sulfide at pressure P = 225 GPa has been determined by solving the system of Eliashberg equations.

• OSTI ID: 22617086
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 124, Issue 1; Other Information: Copyright (c) 2017 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL TEMPERATURE
DENSITY OF STATES
ELECTRON-PHONON COUPLING
ELECTRONS
FERMI LEVEL
FREQUENCY DEPENDENCE
GORKOV-ELIASHBERG THEORY
HYDROGEN SULFIDES
LAYERS
MASS
MASS RENORMALIZATION
METALS
ORDER PARAMETERS
PHONONS
PRESSURE RANGE GIGA PA
SPECTRAL FUNCTIONS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K