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Doping dependence of gap inhomogeneities at Bi2Sr2CaCu2O8 surfaces

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Doping dependence of gap inhomogeneities at Bi2Sr2CaCu2O8 surfaces

Auteurs : Wei Chen [Australie] ; Marc Gabay [France] ; P J Hirschfeld [États-Unis, Allemagne]

Source :

New Journal of Physics [ 1367-2630 ] ; 2012-03.

RBID : ISTEX:58E6C28451590E6354248EEDA20ADA65124A9A93

Descripteurs français

Wicri :
- topic : Simulation.

English descriptors

KwdEn :
- Average pairing, Bandwidth, Boson, Bscco, Bscco surface, Charge degrees, Coherence, Coherence peak, Correlation length, Coulomb, Coulomb interaction, Cuprates, Dopant, Dopants, Doping, Doping level, Enhancement, Fermionic bandwidth, Gure, Hamiltonian, Hole doping, Holon, Holon density, Holons, Homogeneous case, Homogeneous cuprate, Impurity, Impurity site, Inhomogeneity, Large doping, Ldos, Length scale, Lett, Optimal doping, Order parameters, Other hand, Oxygen concentration, Oxygen dopant, Oxygen dopants, Pairing, Pairing enhancement, Pairing interaction, Phenomenological, Phenomenological model, Phys, Present work, Probability distribution, Real space, Simulation, Single oxygen dopant, Slave boson theory, Slave boson treatment, Spinon, Spinon band, Spinon bandwidth, Spinon density, Standard deviation, Strong correlations, Superconducting.
Teeft :
- Average pairing, Bandwidth, Boson, Bscco, Bscco surface, Charge degrees, Coherence, Coherence peak, Correlation length, Coulomb, Coulomb interaction, Cuprates, Dopant, Dopants, Doping, Doping level, Enhancement, Fermionic bandwidth, Gure, Hamiltonian, Hole doping, Holon, Holon density, Holons, Homogeneous case, Homogeneous cuprate, Impurity, Impurity site, Inhomogeneity, Large doping, Ldos, Length scale, Lett, Optimal doping, Order parameters, Other hand, Oxygen concentration, Oxygen dopant, Oxygen dopants, Pairing, Pairing enhancement, Pairing interaction, Phenomenological, Phenomenological model, Phys, Present work, Probability distribution, Real space, Simulation, Single oxygen dopant, Slave boson theory, Slave boson treatment, Spinon, Spinon band, Spinon bandwidth, Spinon density, Standard deviation, Strong correlations, Superconducting.

Abstract

We study the inhomogeneity of the pairing gap near the surface of Bi2Sr2CaCu2O8 due to interstitial oxygen dopants. Within the slave boson mean-field theory of a disordered ttJ model, we identify three aspects of the oxygen dopants related to inhomogeneity: (i) the superexchange interaction is locally enhanced in the vicinity of oxygen dopants, which enhances the local pairing gap and reduces the coherence peak; (ii) oxygen dopants donate holes into the CuO2 plane, which reduces the spinon density of states and hence the average gap at large doping; and (iii) holes are locally attracted to the vicinity of oxygen dopants, which causes an impurity bound state and further reduces the coherence peak. The interplay of these mechanisms simultaneously explains the locally enhanced pairing gap around oxygen dopants and the reduction of average gap with increasing oxygen concentration, as observed by scanning tunneling microscopy.

Url:

https://api.istex.fr/document/58E6C28451590E6354248EEDA20ADA65124A9A93/fulltext/pdf

DOI: 10.1088/1367-2630/14/3/033004

Affiliations:

Allemagne, Australie, France, États-Unis
Floride, Nouvelle-Galles du Sud, Île-de-France
Orsay, Sydney

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Le document en format XML

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Doping dependence of gap inhomogeneities at Bi2Sr2CaCu2O8 surfaces

Doping dependence of gap inhomogeneities at Bi2Sr2CaCu2O8 surfaces

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri