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Title: Infrared conductivity of cuprates using Yang-Rice-Zhang ansatz: Review of our recent investigations

A review of our recent investigations related to the ac transport properties in the psedogapped state of cuprate high temperature superconductors is presented. For our theoretical calculations we use a phenomenological Green’s function proposed by Yang, Rice and Zhang (YRZ). This is based upon the renormalized mean-field theory of the Hubbard model and takes into account the strong electron-electron interaction present in Cuprates. The pseudogap is also taken into account through a proposed self energy. We have tested the form of the Green’s function by computing ac conductivity of cuprates and then compared with experimental results. We found agreement between theory and experiment in reproducing the doping evolution of ac conductivity but there is a problem with absolute magnitudes and their frequency dependence. This shows a partial success of the YRZ ansatz. The ways to rectify it are suggested and worked out.
Authors:
 [1] ;  [2]
  1. Physical Research Laboratory, Navrangpura, Ahmedabad-380009 India, email: navinder.phy@gmail.com, and (India)
  2. H. P. University, Shimla, Himachal Pradesh (India)
Publication Date:
OSTI Identifier:
22391691
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1661; Journal Issue: 1; Conference: ICCMP 2014: International Conference on Condensed Matter Physics 2014, Shimla (India), 4-6 Nov 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPARATIVE EVALUATIONS; CUPRATES; ELECTRIC CONDUCTIVITY; ELECTRON-ELECTRON COUPLING; ENERGY GAP; FREQUENCY DEPENDENCE; HIGH-TC SUPERCONDUCTORS; HUBBARD MODEL; INFRARED RADIATION; MEAN-FIELD THEORY; RENORMALIZATION; SELF-ENERGY