2019
Signatures of the bonding-antibonding splitting in the c-axis infrared response of moderately underdoped bilayer and trilayer cuprate superconductors
MALLETT, BPP.; Přemysl MARŠÍK; Dominik MUNZAR; Christian BERNHARD; Adam DUBROKA et. al.Basic information
Original name
Signatures of the bonding-antibonding splitting in the c-axis infrared response of moderately underdoped bilayer and trilayer cuprate superconductors
Authors
MALLETT, BPP.; Přemysl MARŠÍK (203 Czech Republic); Dominik MUNZAR (203 Czech Republic, belonging to the institution); Christian BERNHARD (276 Germany) and Adam DUBROKA (203 Czech Republic, guarantor, belonging to the institution)
Edition
Physical Review B, College PK, The American Physical Society, 2019, 2469-9950
Other information
Language
English
Type of outcome
Article in a journal
Field of Study
10302 Condensed matter physics
Country of publisher
United States of America
Confidentiality degree
is not subject to a state or trade secret
References:
Impact factor
Impact factor: 3.575
RIV identification code
RIV/00216224:14310/19:00109307
Organization unit
Faculty of Science
UT WoS
000459576600001
EID Scopus
2-s2.0-85062523098
Keywords in English
high temperature superconductors cuprates; far infrared response; phonon anomalies; c-axis
Tags
International impact, Reviewed
Changed: 8/3/2020 19:22, Mgr. Pavla Foltynová, Ph.D.
Abstract
In the original language
We report on results of our analysis of the c-axis infrared conductivity,sigma(c )(omega), of bilayer LnBa(2)Cu(3)O(7-delta) (Ln=La, Nd, Y) and trilayer Bi2Sr2Ca2Cu3O10+delta high-T-c superconductors. The analysis employs the multilayer model involving the conductivity of the bilayer or trilayer unit, sigma(bl) (omega), and that of the spacing layers separating the latter units, sigma(int) (omega). For the YBa2Cu3O7-delta sample with concentration of holes p = 0.09, our fitting of the data strongly suggests that at low temperatures, the conductivity sigma(bl)(omega) possesses a pronounced and narrow Drude peak. For samples with p >= 0.115 however, the fitting indicates that sigma(bl)(omega) is, at low temperatures, dominated by a mode at a finite energy in the range from 30 to 60 meV. The properties of this resonance are in accord with those of a collective mode that appears in the spectra of sigma(bl)(omega) calculated using a microscopic gauge-invariant theory of sigma(c)(omega) by J. Chaloupka and coworkers [Phys. Rev. B 79, 184513 (2009)]. The frequency and spectral weight of the latter mode are determined by the magnitude of the splitting between the bonding and the antibonding band of the bilayer or trilayer unit. Our results, in conjunction with the microscopic theory, thus demonstrate that in moderately underdoped bilayer and trilayer high-T-c cuprates the bilayer (or trilayer) splitting is already developed. The observed doping dependence is consistent with results from angular resolved photoemission spectroscopy.
Links
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