Glue function of optimally and overdoped cuprates from inversion of the Raman spectra
arXiv:1507.02441 · doi:10.1088/0953-8984/28/6/065701
Abstract
We address the issue of identifying the mediators of effective interactions in cuprates superconductors. Specifically, we use inversion theory to analyze Raman spectra of optimally and over-doped LaSrCuO samples. This allows us to extract the so-called glue function without making any a priori assumption based on any specific model. We use instead two different techniques, namely the singular value decomposition and a multi-rectangle decomposition. With both techniques we find consistent results showing that: i) two distinct excitations are responsible for the glue function, which have completely different doping dependence. One excitation becomes weak above optimal doping, where on the contrary the other keeps (or even slightly increases) its strength; ii) there is a marked temperature dependence on the weight and spectral distribution of these excitation, which therefore must have a somewhat critical character. It is quite natural to identify and characterize these two distinct excitations as damped antiferromagnetic spin waves and damped charge density waves, respectively. This sets the stage for a scenario in which superconductivity is concomitant and competing with a charge ordering instability.
14 pages, 10 figures (Main text: 6 pages, 4 figures)
References in corpus (17)
- Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
- A `checkerboard' electronic crystal state in lightly hole-doped Ca_{2-x}Na_{x}CuO_{2}Cl_{2}
- Ubiquitous Interplay between Charge Ordering and High-Temperature Superconductivity in Cuprates
- Quantum phase transitions of metals in two spatial dimensions: II. Spin density wave order
- Interplay of electron-lattice interactions and superconductivity in Bi2Sr2CaCu2O8+d
- How Cooper pairs vanish approaching the Mott insulator in Bi2Sr2CaCu2O8+d
- Resonant X-ray Scattering Study of Charge Density Wave Correlations in YBaCuO
- Strength of the Spin-Fluctuation-Mediated Pairing Interaction in a High-Temperature Superconductor
- Incipient charge order observed by NMR in the normal state of YBa2Cu3Oy
- The symmetry of charge order in cuprates
- Charge-density-wave order with momentum and within the spin-fermion model: continuous and discrete symmetry breaking, preemptive composite order, and relation to pseudogap in hole-doped cuprates
- Disentangling the electronic and phononic glue in a high-Tc superconductor
- Optical determination of the relation between the electron-boson coupling function and the critical temperature in high T cuprates
- Disappearance of antiferromagnetic spin excitations in over-doped LaSrCuO
- Dynamical Properties of Charged Stripes in La_{2-x}Sr_xCuO_4
- Finite band inversion of ARPES in BiSrCaCuO in comparison with optics
- Signatures of nematic quantum critical fluctuations in the Raman spectra of lightly doped cuprates