Superconductivity-induced transverse plasma mode and phonon anomaly in the c-axis response of the bilayer compound RbCa2Fe4As4F2

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00114275" target="_blank" >RIV/00216224:14310/20:00114275 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevB.101.214512" target="_blank" >https://doi.org/10.1103/PhysRevB.101.214512</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.101.214512" target="_blank" >10.1103/PhysRevB.101.214512</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Superconductivity-induced transverse plasma mode and phonon anomaly in the c-axis response of the bilayer compound RbCa2Fe4As4F2

Popis výsledku v původním jazyce

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 -&gt; 0) similar or equal to 1000 Omega(-1)cm(-1) and sigma(int)(1) (omega -&gt; 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.

Název v anglickém jazyce

Superconductivity-induced transverse plasma mode and phonon anomaly in the c-axis response of the bilayer compound RbCa2Fe4As4F2

Popis výsledku anglicky

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 -&gt; 0) similar or equal to 1000 Omega(-1)cm(-1) and sigma(int)(1) (omega -&gt; 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

—

Svazek periodika

101

Číslo periodika v rámci svazku

21

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

1-9

Kód UT WoS článku

000538941200002

EID výsledku v databázi Scopus

2-s2.0-85086995329