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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, 2020, roč.~101, č.~21, s.~1-9. ISSN~2469-9950. Dostupné z: https://dx.doi.org/10.1103/PhysRevB.101.214512.
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