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Doping dependent tunneling conductance in SDW ordered copper oxide superconductors

Abstract

The model calculation reports the co-existences of s-wave superconductivity and spin density wave (SDW) in high-T{sub c} cuprates. The doping dependence of the phase diagram explains the experimental observations qualitatively. The calculated tunneling spectra explains the observed multiple peak structures. This calculation provides an alternative to BCS formalism to calculate order parameters from the spectra. It is observed that doping suppresses the long range anti-ferromagnetic order and induces superconducting phase for a suitable doping. In order to study this effect, we present a model study of the doping dependence of the tunneling conductance in high-T{sub c} systems. The system is described by the Hamiltonian consisting of spin density wave (SDW) and s-wave type superconducting interaction in presence of varying impurity concentrations. The gap equations are calculated by using Green's functions technique of Zubarev. The gap equations and the chemical potential are solved self-consistently. The imaginary part of the electron Green's functions shows the quasi-particle density of states which represent the tunneling conductance observed by the scanning tunneling microscopy (STM). We investigate the effect of impurity on the gap equations as well as on the tunneling conductance. The results will be discussed based on the experimental observations.
Authors:
Rout, G.C., E-mail: gcr@iopb.res.in; [1]  Panda, S K [2] 
  1. Condensed Matter Physics Group, Dept. of Applied Physics and Ballistics, F.M. University, 756 019 Balasore, Orissa (India)
  2. K.D. Science College, Pochilima, Hinjilicut, 761 101 Ganjam, Orissa (India)
Publication Date:
Jul 15, 2011
Product Type:
Journal Article
Resource Relation:
Journal Name: Physica. C, Superconductivity; Journal Volume: 471; Journal Issue: 13-14; Other Information: DOI: 10.1016/j.physc.2011.04.005; PII: S0921-4534(11)00067-0; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BCS THEORY; COMPUTERIZED SIMULATION; COPPER OXIDES; CUPRATES; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; GREEN FUNCTION; HAMILTONIANS; HIGH-TC SUPERCONDUCTORS; IMPURITIES; INTERACTIONS; ORDER PARAMETERS; PHASE DIAGRAMS; S WAVES; SCANNING TUNNELING MICROSCOPY; SPECTRA; SPIN; TUNNEL EFFECT; ANGULAR MOMENTUM; CHALCOGENIDES; COPPER COMPOUNDS; DIAGRAMS; DIMENSIONLESS NUMBERS; ELECTRICAL PROPERTIES; FUNCTIONS; INFORMATION; MATERIALS; MATHEMATICAL OPERATORS; MICROSCOPY; OXIDES; OXYGEN COMPOUNDS; PARTIAL WAVES; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; QUANTUM OPERATORS; SIMULATION; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; TYPE-II SUPERCONDUCTORS
OSTI ID:
21593882
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0921-4534; PHYCE6; TRN: NL12R7286072329
Availability:
Available from http://dx.doi.org/10.1016/j.physc.2011.04.005
Submitting Site:
NLN
Size:
page(s) 400-405
Announcement Date:
Sep 01, 2012

Citation Formats

Rout, G.C., E-mail: gcr@iopb.res.in, and Panda, S K. Doping dependent tunneling conductance in SDW ordered copper oxide superconductors. Netherlands: N. p., 2011. Web. doi:10.1016/j.physc.2011.04.005.
Rout, G.C., E-mail: gcr@iopb.res.in, & Panda, S K. Doping dependent tunneling conductance in SDW ordered copper oxide superconductors. Netherlands. doi:10.1016/j.physc.2011.04.005.
Rout, G.C., E-mail: gcr@iopb.res.in, and Panda, S K. 2011. "Doping dependent tunneling conductance in SDW ordered copper oxide superconductors." Netherlands. doi:10.1016/j.physc.2011.04.005. https://www.osti.gov/servlets/purl/10.1016/j.physc.2011.04.005.
@misc{etde_21593882,
title = {Doping dependent tunneling conductance in SDW ordered copper oxide superconductors}
author = {Rout, G.C., E-mail: gcr@iopb.res.in, and Panda, S K}
abstractNote = {The model calculation reports the co-existences of s-wave superconductivity and spin density wave (SDW) in high-T{sub c} cuprates. The doping dependence of the phase diagram explains the experimental observations qualitatively. The calculated tunneling spectra explains the observed multiple peak structures. This calculation provides an alternative to BCS formalism to calculate order parameters from the spectra. It is observed that doping suppresses the long range anti-ferromagnetic order and induces superconducting phase for a suitable doping. In order to study this effect, we present a model study of the doping dependence of the tunneling conductance in high-T{sub c} systems. The system is described by the Hamiltonian consisting of spin density wave (SDW) and s-wave type superconducting interaction in presence of varying impurity concentrations. The gap equations are calculated by using Green's functions technique of Zubarev. The gap equations and the chemical potential are solved self-consistently. The imaginary part of the electron Green's functions shows the quasi-particle density of states which represent the tunneling conductance observed by the scanning tunneling microscopy (STM). We investigate the effect of impurity on the gap equations as well as on the tunneling conductance. The results will be discussed based on the experimental observations.}
doi = {10.1016/j.physc.2011.04.005}
journal = {Physica. C, Superconductivity}
issue = {13-14}
volume = {471}
place = {Netherlands}
year = {2011}
month = {Jul}
}