A minimum single-band model for low-energy excitations in superconducting AxFe2−ySe2 View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2012-07

AUTHORS

T. Zhou, Z. D. Wang

ABSTRACT

We propose a phenomenological single-band model for the newly discovered iron-selenide superconductors AxFe2−ySe2 (A = Tl, K, Rb, Cs). Based on this minimum model and the random phase approximation, the dx² − y² pairing symmetry is revealed theoretically, which may be understood in the framework of Fermi surface topology. A common origin of superconductivity is elucidated for this compound and other high-Tc materials. The spin excitations at (π,π/2) in superconducting states are observed, in good agreement with the neutron scattering experiments. The spin resonance is indicated to show up only for the d-wave pairing, which provides an additional indication for the d-wave pairing symmetry in this family of superconductors. More... »

PAGES

224

References to SciGraph publications

Journal

TITLE

The European Physical Journal B

ISSUE

7

VOLUME

85

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1140/epjb/e2012-30315-8

DOI

http://dx.doi.org/10.1140/epjb/e2012-30315-8

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1038319591


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45 schema:description We propose a phenomenological single-band model for the newly discovered iron-selenide superconductors AxFe2−ySe2 (A = Tl, K, Rb, Cs). Based on this minimum model and the random phase approximation, the dx² − y² pairing symmetry is revealed theoretically, which may be understood in the framework of Fermi surface topology. A common origin of superconductivity is elucidated for this compound and other high-Tc materials. The spin excitations at (π,π/2) in superconducting states are observed, in good agreement with the neutron scattering experiments. The spin resonance is indicated to show up only for the d-wave pairing, which provides an additional indication for the d-wave pairing symmetry in this family of superconductors.
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