Phonon self-energy effects due to superconductivity in Bi2Sr2CaCu2O81d
نویسندگان
چکیده
Raman scattering of A1g phonons in Bi2Sr2CaCu2O81d single crystals ~d50.13, Tc586 K! has been measured as a function of temperature. We report an anomalous softening in the frequency and a decrease in the linewidth of the A1g phonon at 290 cm 21 ~O1,2 c-axis in-phase vibration! below Tc . We also confirm a smaller anomalous softening in the frequency of the A1g phonon at 465 cm 21 ~O3 c-axis vibration!, but for this phonon mode no linewidth anomaly has been found. We compare the anomalous softening and linewidth behavior in the superconducting state with theoretical calculations for isotropic s-wave, planar d-wave, and dx22y2 gap symmetries and as for a layered superconductor model. @S0163-1829~97!09837-8#
منابع مشابه
نرم شدگی فونون‌های انرژی بالا با گذار عایق - ابررسانا در سیستم ابررسانای Ba1-xKxBiO3
Single crystals of Ba1-xKxBiO3 compound for 0 < x <0.6 from insulator to superconducting region have been grown by electrochemical method. The crystals have been characterized by powder x-ray diffraction and Laue x-ray to determine the crystal structure, formed phases and potassium concentration. Inelastic x-ray scattering spectrum of the crystals has been studied to investigate the phonon pro...
متن کاملThermodynamic Green functions in theory of superconductivity
A general theory of superconductivity is formulated within the thermodynamic Green function method for various types of pairing mediated by phonons, spin fluctuations, and strong Coulomb correlations in the Hubbard and t-J models. A rigorous Dyson equation for matrix Green functions is derived in terms of a self-energy as a many-particle Green function. By applying the noncrossing approximation...
متن کاملElectron-phonon interaction via electronic and lattice Wannier functions: superconductivity in boron-doped diamond reexamined.
We present a first-principles technique for investigating the electron-phonon interaction with millions of k points in the Brillouin zone, which exploits the spatial localization of electronic and lattice Wannier functions. We demonstrate the effectiveness of our technique by elucidating the phonon mechanism responsible for superconductivity in boron-doped diamond. Our calculated phonon self-en...
متن کاملMulti-Gap Superconductivity in MgB2: Magneto-Raman Spectroscopy
Electronic Raman scattering studies on MgB2 single crystals as a function of excitation and polarization have revealed three distinct superconducting features: a clean gap below 37 cm and two coherence peaks at 109 cm and 78 cm which we identify as the superconducting gaps in πand σ-bands and as the Leggett’s collective mode arising from the fluctuation in the relative phase between two superco...
متن کاملQuasiparticle spectra, charge-density waves, superconductivity, and electron-phonon coupling in 2H-NbSe2.
High-resolution photoemission has been used to study the electronic structure of the charge-density wave (CDW) and superconducting dichalcogenide, 2H-NbSe2. From the extracted self-energies, important components of the quasiparticle interactions have been identified. In contrast to previously studied TaSe2, the CDW transition does not affect the electronic properties significantly. The electron...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997