ELECTRON PHONON INTERACTION VS. SPIN FLUCTUATION EFFECTS IN ITINERANT ELECTRON MAGNETISM

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-77-C8-78
Author(s):  
C. Tanaka
Keyword(s):  
Spin Fluctuation ◽  
Itinerant Electron ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Fluctuation Effects

scholarly journals Influence of electron-phonon interaction on spin-fluctuation-induced superconductivity

1999 ◽  
Vol 59 (13) ◽  
pp. 8859-8868 ◽  
Author(s):  
T. S. Nunner ◽  
J. Schmalian ◽  
K. H. Bennemann
Keyword(s):  
Spin Fluctuation ◽  
Phonon Interaction ◽  
Electron Phonon Interaction

ELECTRONIC THEORY FOR ELECTRON-DOPED CUPRATE SUPERCONDUCTORS: d-WAVE SUPERCONDUCTIVITY AND THE PHASE DIAGRAM

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3555-3560
Author(s):  
D. MANSKE ◽  
I. EREMIN ◽  
K. H. BENNEMANN
Keyword(s):  
Cuprate Superconductors ◽  
Narrow Range ◽  
Spin Fluctuation ◽  
Flat Band ◽  
Superconducting Transition ◽  
Phonon Interaction ◽  
Pairing Mechanism ◽  
Lattice Disorder ◽  
Electron Phonon Interaction ◽  
The One

Using the one-band Hubbard Hamiltonian we determine various basic properties of the electron-doped cuprate superconductor Nd 2-x Ce x CuO 4 for a spin-fluctuation-induced pairing mechanism. We find a narrow range of superconductivity and, most importantly, like for hole-doped cuprates dx2-y2 -symmetry for the superconducting order parameter. The superconducting transition temperatures Tc(x) for various electron doping concentrations x are calculated to be much smaller than for hole-doped cuprates due to the different energy dispersion and a flat band well below the Fermi level. We find that lattice disorder may sensitively distort the dx2-y2 -symmetry via electron-phonon interaction yielding a finite isotope exponent α0.

MAGNETIZATION DEPENDENCE OF PHONON EFFECT ON VOLUME OF AN ITINERANT ELECTRON FERROMAGNET

1993 ◽  
Vol 07 (01n03) ◽  
pp. 695-698
Author(s):  
Masao OSHIMA ◽  
Nobuhiro HAMAGUCHI ◽  
Shinji FUKUMOTO ◽  
D.J. KIM
Keyword(s):  
Numerical Calculation ◽  
Anomalous Behavior ◽  
Itinerant Electron ◽  
Phonon Interaction ◽  
Electronic Density ◽  
Electron Phonon Interaction ◽  
Temperature Dependences ◽  
Magnetization Dependence ◽  
Grüneisen Constant

Volume behavior is often anomalous for T<Tc of an itinerant electron ferromagnet. Recently Kim pointed out that phonons also can be responsible for such anomalous behavior. Further to explore such possible role of phonons, in this paper we carry out a numerical calculation on the temperature dependences of phonon Debye temperature and Grüneisen constant of an itinerant electron ferromagnet by using a model electronic density of states. Our numerical results support our earlier conclusion and demonstrate the importance of taking into account the effect of the electron-phonon interaction in understanding the anomalous volume and elasticity behavior of an itinerant electron ferromagnet.

ZERO—POINT SPIN FLUCTUATION EFFECTS IN ANHARMONIC WEAK ITINERANT ELECTRON MAGNETS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 585-588 ◽  
Author(s):  
ALEXANDER SOLONTSOV
Keyword(s):  
Inelastic Neutron Scattering ◽  
Spin Fluctuation ◽  
Landau Theory ◽  
Zero Point ◽  
Thermal Fluctuations ◽  
Inelastic Neutron ◽  
Spin Fluctuations ◽  
Itinerant Electron ◽  
Fluctuation Effects

The spin fluctuation theory of weak itinerant magnets is critically reviewed and is shown to be well established in the weak spin anharmonicity limit. A new self—consistent approach is formulated in terms of the Landau theory of phase transitions to account for zero—point and thermal fluctuations in anharmonic itinerant magnets. The role of spin fluctuations and Fermi excitations in MnSi, Ni3Al and ZrZn2 is discussed using the inelastic neutron scattering experiments.

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