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Bound clusters and pseudogap transitions in layered high-Tc superconductors
journal contribution
posted on 2015-06-30, 12:32 authored by M. Saarela, Feodor KusmartsevWe show that negatively charged dopant ions in
hole-doped, layered, high-Tc superconductors induce at low
doping bound clusters of four holes in CuO layers. This
phenomenon requires double degeneracy of the hole band
provided by the anti-Jahn-Teller effect, where dopant ions
push apical oxygen ions into their symmetry positions and
release holes from Copper atoms. Experimentally, that is
seen as nanoscale inhomogeneity in the pseudogap region.
The broad pseudogap transition contains two separate transitions.
We connect the higher temperature transition to
unbinding of clustered holes out of the spin-singlet state in
the CuO plane. The lower temperature transition removes
directional stripy order of these dipolar clusters, and the
bosonic, spin-zero band disappears. We report results on
energetics of the cluster formation and fit the density parameter
rs and dielectric constant to Hall measurements. Our
model leads to the quantum critical point at doping 0.2
where bound clusters disappear at zero temperature.
Funding
We thank NanoSc-Cost Action MP1201 for financial support
History
School
- Science
Department
- Physics
Published in
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISMVolume
28Issue
4Pages
1337 - 1341 (5)Citation
SAARELA, M. and KUSMARTSEV, F.V., 2015. Bound clusters and pseudogap transitions in layered high-Tc superconductors. Journal of Superconductivity and Novel Magnetism, 28 (4), pp. 1337 - 1341.Publisher
© Springer Science+Business MediaVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015Notes
This article is closed access.ISSN
1557-1939Publisher version
Language
- en