Enhancement, Reduction and Inversion of Isotope Effects Due to Anharmonic Phonons : Migdal-Eliashberg Theory for Superconductivity
スポンサーリンク
概要
- 論文の詳細を見る
Superconducting transition temperatures of a many-electron system coupledstrongly w'ith anharmonic PIIOIIOIIS have been studied, to clarify how drasticallyanlaarmonicity changes tlae isotope effect from the harmonic case. The diagonal self-energy of electron as well as tlte off-diagonal one is determined self-consistentlywitlain Migdal's approxinaation. Typical two types of anharmonicities are studied.The first is a sextic anharmonicity induced by a hard-core repulsion. Isotope shiftsbecome almost zero in this case. Whena Thais repulsion is stronger, the shifts are re-versed. The second is a small negative quartic anharmonicity in additiora to the sexticone, just in tlae case of a mixture of a hard-core and a soft one. In this case, on thecontrary, the slaifts are greatly enhancecl. Discussion is also given in relation to the ob-served anomalous isotope effects of newly discovered superconductors[isotope effect, superconductivity, N4igda1-Eliashberg theory, anharmonic ll phononl
- 社団法人日本物理学会の論文
- 1992-12-15
著者
-
Nasu Keiichiro
Institute For Molecular Science
-
Nasu Keiichiro
Institute For Molecular Science Graduate University For Advanced Studies
-
INADA Yasuzi
Institute for Molecular Science,Graduate University for Advanced Studies
-
Inada Yasuzi
Institute For Molecular Science Graduate University For Advanced Studies
関連論文
- Theory of Photoinduced Phase Transitions(Photo-Induced Phase Transitions and their Dynamics)
- Intermediately Correlated Many-electron Systems Studied by Quantum Monte Carlo Method
- Intermediately Correlated Many-electron Systems Studied by Quantum Monte Carlo Method
- Theory for Photoinduced Ionic-Neutral Structural Phase Transition in Quasi One-Dimensional Organic Molecular Crystal TTF-CA : Condensed Matter: Electronic Properties, etc.
- Extended Peierls-Hubbard Model for One-Dimensional N-Sites N-Electrons System.III.Lattice Relaxation after Optical Excitation in CDW
- Theory for Special Shape of Optical Absorption in Halogen-Bridged Mixed-Valent Metal Complexes
- Ab initio MO Studies of the Hole Delocalization in Copper Oxides and Related Species: Necessity of the Extended Hubbard Model : Electrical Properties of Condensed Matter
- Ab initio MO Studies on the Correlation and Spin Correlation Effects for Copper-Oxygen and Copper-Halogen Bonds in High-T_c Copper Oxide Superconductors
- Ab Initio MO Calculations of Effective Exchange Integrals between Transition-Metal Ions via Oxygen Dianions : Nature of the Copper-Oxygen Bonds and Superconductivity
- Initial Condition Sensitivity in Photoinduced Structural Phase Transitions : An Iterative Equation for Exciton Proliferation during Lattice Relaxation
- Lattice Relaxation and Time Resolved Polarization of Emission from Localized Electron with Level Crossing
- Lattice Relaxation Dynamics of Excitons and Elementary Nonlinear Processes in Photoinduced Structural Phase Transitions : Aggregation, Growth and Proliferation : Condensed Matter: Electronic Properties, etc.
- Extended Peierls-Hubbard Model for One-Dimensional N-Sites N-Electrons System.I.Phase Diagram by Mean Field Theory
- Theory for Optical Absorption,Direct and Indirect Excitons in BaBiO_3
- Many-Polaron Theory for CDW,SDW and Superconducting Phases in One-Dimensional N-Sites N-Elctrons System : Quantum-Classic Crossover
- Difference between Photoinduced Phase and Thermally Excited Phase
- Resonant Raman Scattering in (E × e) Jahn-Teller System
- Tunneling Process from Free State to Self-Trappd State of Exciton
- Enhancement, Reduction and Inversion of Isotope Effects Due to Anharmonic Phonons : Migdal-Eliashberg Theory for Superconductivity
- Extended Peierls-Hubbard Model for One-Dimensional N-Sites N-Electrons System.II.Effect of Fluctuation,Optical and Magnetic Excitations
- Initial Condition Sensitivity in Photoinduced Structural Phase Transitions — An Iterative Equation for Exciton Proliferation during Lattice Relaxation —
- 25aYD-13 Path-integral theory for photoemission spectra of electron-phonon coupling systems