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@article{1331277,
author = {Šopík, Břetislav and Chaloupka, Jiří and Dubroka, Adam and Bernhard, Christian and Munzar, Dominik},
article_location = {Britosl (Velká Británie)},
article_number = {May},
doi = {http://dx.doi.org/10.1088/1367-2630/17/5/053022},
keywords = {cuprate superconductors; infrared response; precursor superconducting pairing above T-c},
language = {eng},
issn = {1367-2630},
journal = {New Journal of Physics},
title = {Evidence for precursor superconducting pairing above T-c in underdoped cuprates from an analysis of the in-plane infrared response},
url = {http://iopscience.iop.org/article/10.1088/1367-2630/17/5/053022},
volume = {17},
year = {2015}
}
TY - JOUR
ID - 1331277
AU - Šopík, Břetislav - Chaloupka, Jiří - Dubroka, Adam - Bernhard, Christian - Munzar, Dominik
PY - 2015
TI - Evidence for precursor superconducting pairing above T-c in underdoped cuprates from an analysis of the in-plane infrared response
JF - New Journal of Physics
VL - 17
IS - May
SP - "nestránkováno"
EP - "nestránkováno"
PB - IOP PUBLISHING LTD
SN - 13672630
KW - cuprate superconductors
KW - infrared response
KW - precursor superconducting pairing above T-c
UR - http://iopscience.iop.org/article/10.1088/1367-2630/17/5/053022
L2 - http://iopscience.iop.org/article/10.1088/1367-2630/17/5/053022
N2 - We performed calculations of the in-plane infrared response of underdoped cuprate superconductors to clarify the origin of a characteristic dip feature which occurs in the published experimental spectra of the real part of the in-plane conductivity below an onset temperature T-ons considerably higher than T-c. We provide several arguments, based on a detailed comparison of our results with the published experimental data, confirming that the dip feature and the related features of the memory function M(omega)= M1(omega)+ iM2(omega)(a peak in M1 and a kink in M2) are due to superconducting pairing correlations that develop below T-ons. In particular, we show that (i) the dip feature, the peak and the kink of the low-temperature experimental data can be almost quantitatively reproduced by calculations based on a model of a d-wave superconductor. The formation of the dip feature in the experimental data below T-ons is shown to be analogous to the one occurring in the model spetra below T-c. (ii) Calculations based on simple models, for which the dip in the temperature range from T-c to T-ons is unrelated to superconducting pairing, predict a shift of the onset of the dip at the high-energy side upon entering the superconducting state, that is not observed in the experimental data; (iii) the conductivity data in conjunction with the recent photoemission data (Reber et al 2012 Nat. Phys. 8 606, Reber et al 2013 Phys. Rev. B 87 060506) imply the persistence of the coherence factor characteristic of superconducting pairing correlations in a range of temperatures above T-c.
ER -
ŠOPÍK, Břetislav, Jiří CHALOUPKA, Adam DUBROKA, Christian BERNHARD and Dominik MUNZAR. Evidence for precursor superconducting pairing above T-c in underdoped cuprates from an analysis of the in-plane infrared response. \textit{New Journal of Physics}. Britosl (Velká Británie): IOP PUBLISHING LTD, 2015, vol.~17, May, p.~''nestránkováno'', 18 pp. ISSN~1367-2630. Available from: https://dx.doi.org/10.1088/1367-2630/17/5/053022.
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