Quasiparticlelike peaks, kinks, and electron-phonon coupling at the (pi,0) regions in the CMR oxide La2-2x Sr1+2x Mn2 O7.
نویسندگان
چکیده
Using angle-resolved photoemission, we have observed sharp quasiparticlelike peaks in the prototypical layered manganite La(2-2x)Sr(1+2x)Mn(2)O(7) (x=0.36,0.38). We focus on the (pi,0) regions of k space and study their electronic scattering rates and dispersion kinks, uncovering bilayer-split bands, the critical energy scales, momentum scales, and strengths of the interactions that renormalize the electrons. To identify these bosons, we measured phonon dispersions in the energy range of the kink by inelastic neutron scattering, finding a good match in both energy and momentum to the oxygen bond-stretching phonons.
منابع مشابه
نقش دینامیک شبکه در ابررسانای La2-xBaxCuO4 به روش DFT
Electron-phonon coupling parameters are calculated for La2-x BaxCuO4 cuprate superconductor in a wide range of dopings, from undoped to overdoped compounds. In this study we aim to study the quality of such calculations based on DFT method so, the results of σ GGA+U electronic structure calculations are also investigated. The obtained value for electron-phonon coupling is in the same order of p...
متن کاملDetermination of the Electron Phonon Coupling and the Superconducting Gap in/I-(BEDT-TTF)2X Crystals (X = I3, IAuI)
A. Nowack 1, U. Poppe 2, M. Weger 3, D. Schweitzer 4, and H. Schwenk s 1 II. Physikalisches Institut, Universitfit K61n, Federal Republic of Germany 2 Institut ffir Festk6rperforschung KFA Jiilich, Federal Republic of Germany 3 Racah Institute of Physics, Hebrew University, Jerusalem, Israel 4 Max Planck-Institut ffir Medizinische Forschung, Abteilung ffir Molekulare Physik, Heidelberg, Federal...
متن کاملSensitivity of Perfect and Stone-Wales Defective BNNTs Toward NO Molecule: A DFT/M06-2X Approach
The monitoring and controlling of environmental pollutions are very important in biological and industrial processes, and a great interest is growing with the development of suitable gas–sensitive materials and hazardous chemical removal devices. In this work, the highly parameterized, empirical exchange–correlation functional M06–2X were employed to investigate the electronic sensitivity of pe...
متن کاملOn the broadening of low dimension van Hove singularities in oxide superconductors
2014 It is pointed out that the transverse couplings and, accessorily, the longitudinal scattering by doping and phonons broaden enough the 2d van Hove singularities of Cu O2 planes to prevent their spontaneous Jahn Teller splitting. The tetragonal-orthorhombic phase changes observed in La2-x Srx Cu O4-y and Y Ba2 Cu3 O7-03B4 have then different origins and nature. In good crystals, this broade...
متن کاملAnomalous Structural Change of Layered Perovskite Manganites La2-2x Sr1+2xMn2O7
The temperature-dependent structural changes were investigated by using the X-ray diffraction and the Extended X-ray absorption fine spectroscopy (EXAFS) for layered perovskite manganites La2-2xSr1+2xMn2O7 (x=0.33 and 0.4). The anomalous changes of Mn-O bond length and Jahn-Teller (J-T) distortion of MnO6 octahedron were observed, corresponding to ferromagnetic transition temperature (~ 120 K)....
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 97 5 شماره
صفحات -
تاریخ انتشار 2006