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@article{1674760,
author = {Xu, B. and Munzar, Dominik and Dubroka, Adam and Sheveleva, E. and Lyzwa, F. and Marsik, P. and Wang, C. N. and Wang, Z. C. and Cao, G. H. and Bernhard, C.},
article_location = {College PK},
article_number = {21},
doi = {http://dx.doi.org/10.1103/PhysRevB.101.214512},
keywords = {HIGH-TEMPERATURE SUPERCONDUCTORS; INFRARED CONDUCTIVITY; OPTICAL PHONONS; CHARGE DYNAMICS; PSEUDOGAP; YBA2CU3OY; STATE; GAP},
language = {eng},
issn = {2469-9950},
journal = {Physical Review B},
title = {Superconductivity-induced transverse plasma mode and phonon anomaly in the c-axis response of the bilayer compound RbCa2Fe4As4F2},
url = {https://doi.org/10.1103/PhysRevB.101.214512},
volume = {101},
year = {2020}
}
TY - JOUR
ID - 1674760
AU - Xu, B. - Munzar, Dominik - Dubroka, Adam - Sheveleva, E. - Lyzwa, F. - Marsik, P. - Wang, C. N. - Wang, Z. C. - Cao, G. H. - Bernhard, C.
PY - 2020
TI - Superconductivity-induced transverse plasma mode and phonon anomaly in the c-axis response of the bilayer compound RbCa2Fe4As4F2
JF - Physical Review B
VL - 101
IS - 21
SP - 1-9
EP - 1-9
PB - The American Physical Society
SN - 24699950
KW - HIGH-TEMPERATURE SUPERCONDUCTORS
KW - INFRARED CONDUCTIVITY
KW - OPTICAL PHONONS
KW - CHARGE DYNAMICS
KW - PSEUDOGAP
KW - YBA2CU3OY
KW - STATE
KW - GAP
UR - https://doi.org/10.1103/PhysRevB.101.214512
L2 - https://doi.org/10.1103/PhysRevB.101.214512
N2 - We studied the infrared response of polycrystalline samples of the iron arsenide superconductor (Rb, Cs)Ca2Fe4As4F2 (Rb,Cs-12442), which has a bilayer structure similar to the high-T-c cuprates YBa2Cu3O7 (YBCO) and Bi2Sr2CaCu2O8. The c-axis reflectivity spectra R-c have been derived from the reflectivity spectra of the polycrystalline samples R-poly and the in-plane spectrum of a corresponding Cs-12442 crystal R-ab using a geometrical averaging approach with R-c = 3R(poly) - 2R(ab). In analogy to the c-axis response of the cuprates, we observe a superconductivity-induced transverse plasma mode and a phonon anomaly that are both signatures of local electric field effects that arise from a large difference between the local conductivities in the intra- and interbilayer regions. Using a multilayer model developed for the cuprates, we obtain a good description of the c-axis response and derive the local conductivities at T similar or equal to T-c of sigma(bl)(1) (omega -> 0) similar or equal to 1000 Omega(-1)cm(-1) and sigma(int)(1) (omega -> 0) similar or equal to 15 Omega(-1)cm(-1), respectively, that are similar to the ones previously found in underdoped YBCO. Different from the cuprates, we find no evidence of a normal-state pseudogap in terms of a partial suppression of the low-energy electronic states that sets in already well above T-c. There is also no clear sign of an onset of precursor superconducting pairing correlations well above T-c similar or equal to 30 K. This highlights that the pseudogap and the precursor superconducting pairing well above T-c are unique features of the cuprates with their strong electronic correlations and, for example, not just the result of a strongly anisotropic electronic response due to the layered crystal structure.
ER -
XU, B., Dominik MUNZAR, Adam DUBROKA, E. SHEVELEVA, F. LYZWA, P. MARSIK, C. N. WANG, Z. C. WANG, G. H. CAO a C. BERNHARD. Superconductivity-induced transverse plasma mode and phonon anomaly in the c-axis response of the bilayer compound RbCa2Fe4As4F2. \textit{Physical Review B}. College PK: The American Physical Society, roč.~101, č.~21, s.~1-9. ISSN~2469-9950. doi:10.1103/PhysRevB.101.214512. 2020.
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