Optical Phonons and Their Role in High‐<i>T</i><sub>c</sub> Superconductivity Mechanism

Ėvarestov, R. A.; Kitaev, Yu. É.; Лимонов, М. Ф.; Panfilov, A. G.

doi:10.1002/pssb.2221790202

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1994

2021

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Cited by 9 publications

(1 citation statement)

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“…The latter approach allows one to predict the low symmetry and intermediate structure types which may not have been yet observed. It is also useful when analyzing periodic superlattices (Evarestov et al, 1993), (Kitaev et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

High-symmetry approximations of AX3 crystal structures retrieved with the method of hierarchical trees

Vaganov

2021

JAP

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Section: Introductionmentioning

confidence: 99%

High-symmetry approximations of AX3 crystal structures retrieved with the method of hierarchical trees

Vaganov

2021

JAP

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Induced Representations of Space Groups in Phonon Spectroscopy of Crystals

Ėvarestov

Smirnov²

1997

Springer Series in Solid-State Sciences

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Lattice Dynamics and Electron-Phonon Interaction

Плакида

1995

High-Temperature Superconductivity

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We present a Raman scattering study of Ca2RuO4, in which we investigate the temperature-dependence of the lattice dynamics and the electron-phonon interaction below the metal-insulator transition temperature (TMI). Raman spectra obtained in a backscattering geometry with light polarized in the ab-plane reveal 9 B1g phonon modes (140, 215, 265, 269, 292, 388, 459, 534, and 683 cm −1) and 9 Ag phonon modes (126, 192, 204, 251, 304, 322, 356, 395, and 607 cm −1) for the orthorhombic crystal structure (Pbca−D 15 2h). With increasing temperature toward TMI, the observed phonon modes shift to lower energies and exhibit reduced spectral weights, reflecting structural changes associated with the elongation of the RuO6 octahedra. Interestingly, the phonons exhibit significant increases in linewidths and asymmetries for T > TN. These results indicate that there is an increase in the effective number of electrons and the electron-phonon interaction strengths as the temperature is raised through TN, suggesting the presence of orbital fluctuations in the temperature regime TN < T < TMI.

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Optical Phonons and Their Role in High‐T_c Superconductivity Mechanism

Cited by 9 publications

References 90 publications

High-symmetry approximations of AX3 crystal structures retrieved with the method of hierarchical trees

High-symmetry approximations of AX3 crystal structures retrieved with the method of hierarchical trees

Induced Representations of Space Groups in Phonon Spectroscopy of Crystals

Lattice Dynamics and Electron-Phonon Interaction

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Optical Phonons and Their Role in High‐Tc Superconductivity Mechanism

Cited by 9 publications

References 90 publications

High-symmetry approximations of AX3 crystal structures retrieved with the method of hierarchical trees

High-symmetry approximations of AX3 crystal structures retrieved with the method of hierarchical trees

Induced Representations of Space Groups in Phonon Spectroscopy of Crystals

Lattice Dynamics and Electron-Phonon Interaction

Contact Info

Product

Resources

About

Optical Phonons and Their Role in High‐T_c Superconductivity Mechanism