Evidence for precursor superconducting pairing above T-c in underdoped cuprates from an analysis of the in-plane infrared response

Logo poskytovatele
Logo poskytovatele
Logo poskytovatele

Varování

Publikace nespadá pod Filozofickou fakultu, ale pod Středoevropský technologický institut. Oficiální stránka publikace je na webu muni.cz.
Autoři

ŠOPÍK Břetislav CHALOUPKA Jiří DUBROKA Adam BERNHARD Christian MUNZAR Dominik

Rok publikování 2015
Druh Článek v odborném periodiku
Časopis / Zdroj New Journal of Physics
Fakulta / Pracoviště MU

Středoevropský technologický institut

Citace
www http://iopscience.iop.org/article/10.1088/1367-2630/17/5/053022
Doi http://dx.doi.org/10.1088/1367-2630/17/5/053022
Obor Fyzika pevných látek a magnetismus
Klíčová slova cuprate superconductors; infrared response; precursor superconducting pairing above T-c
Popis 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.
Související projekty:

Používáte starou verzi internetového prohlížeče. Doporučujeme aktualizovat Váš prohlížeč na nejnovější verzi.