Bosonic Spectral Density of Epitaxial Thin-FilmLa1.83Sr0.17CuO4Superconductors from Infrared Conductivity Measurements

2007/10/31 by J. Hwang, Jungseek Hwang, E. Schachinger +5 · 4 citations
Chemistry · Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Analytical Chemistry (journal) #Chemistry #Condensed matter physics #Epitaxy #High-pressure geophysics and materials #Magnetic and transport properties of perovskites and related materials #Materials science #Nanotechnology #Nuclear magnetic resonance #Optical spectra #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spectral line #Spectroscopy #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.100.137005

published as Physical Review Letters, 100, 137005 (2008).

openalex publication_date 2008/04/03 · arxiv created 2008/04/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We use optical spectroscopy to investigate the excitations responsible for the structure in the optical self-energy of thin epitaxial films of La_1.83Sr_0.17CuO₄. Using Eliashberg's formalism to invert the optical spectra we extract the electron-boson spectral function and find that at low temperature it has a two component structure closely matching the spin excitation spectrum recently measured by magnetic neutron scattering. We contrast the temperature evolution of the spectral density and the two-peak behavior in La_2\ensuremath-xSr_xCuO₄ with another high temperature superconductor Bi₂Sr₂CaCu₂O_8+\ensuremathδ. The bosonic spectral functions of the two materials account for the low T_c of LSCO as compared to Bi-2212.

Citations

• Interplay of electron–lattice interactions and superconductivity in Bi2Sr2CaCu2O8+δ
• Evidence for ubiquitous strong electron–phonon coupling in high-temperature superconductors
• A Relation between the Resonance Neutron Peak and ARPES Data in Cuprates
• Properties of boson-exchange superconductors
• Two energy scales in the spin excitations of the high-temperature superconductor La2−xSrxCuO4
• Transition Temperature of Strong-Coupled Superconductors
• Electronic Spectra and Their Relation to the(π,π)Collective Mode in High-TcSuperconductors

Cited by

• Intermediate coupling model of the cuprates
• Pairing dynamics in strongly correlated superconductivity
• Superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function
• Optical Spectroscopy of SuperconductingBa0.55K0.45Fe2As2: Evidence for Strong Coupling to Low-Energy Bosons