Systematics of c-axis phonons in the thallium- and bismuth-based cuprate superconductors

Journal Article · Mon Nov 01 04:00:00 EST 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.60.13196· OSTI ID:690736

Tsvetkov, A A ^[1]; Dulic, D; van der Marel, D; Damascelli, A ^[1]; Kaljushnaia, G A; Gorina, J I; Senturina, N N ^[2]; Kolesnikov, N N ^[3]; Ren, Z F; Wang, J H ^[4]; Menovsky, A A ^[5]; Palstra, T T ^[6]

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1. Laboratory of Solid State Physics, Materials Science Center, Groningen University, Nijenborgh 4, 9747 AG Groningen (The Netherlands)
2. P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect 53, 117924 Moscow (Russia)
3. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka 142432 (Russia)
4. Department of Chemistry, SUNY at Buffalo, Buffalo, New York 14260-3000 (United States)
5. Van der Waals--Zeeman Laboratory, University of Amsterdam, Amsterdam (The Netherlands)
6. Inorganic Solid State Chemistry Laboratory, Materials Science Center, Groningen University, Nijenborgh 4, 9747 AG Groningen (The Netherlands)

We present grazing incidence reflectivity measurements in the far-infrared region at temperatures above and below T{sub c} for a series of thallium- (Tl{sub 2}Ba{sub 2}CuO{sub 6}, Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8}) and bismuth- (Bi{sub 2}Sr{sub 2}CuO{sub 6}, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}, and Bi{sub 2{minus}x}Pb{sub x}Sr{sub 2}CaCu{sub 2}O{sub 8}) based cuprate superconductors. From the spectra, which are dominated by the c-axis phonons, longitudinal optical (LO) frequencies are directly obtained. The reflectivity curves are well fitted by a series of Lorentz oscillators. In this way the transverse optical (TO) phonon frequencies were accurately determined. On the basis of the comparative study of the Bi- and Tl-based cuprates with a different number of CuO{sub 2} layers per unit cell, we suggest modifications of the assignment of the main oxygen modes. We compare the LO frequencies in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} and Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10} obtained from intrinsic Josephson junction characteristics with our measurements, and explain the discrepancy in LO frequencies obtained by the two different methods. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 690736
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 60; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
COPPER OXIDES
CRITICAL TEMPERATURE
CUPRATES
HIGH-TC SUPERCONDUCTORS
INFRARED SPECTRA
LEAD COMPOUNDS
LEAD OXIDES
PHONONS
REFLECTIVITY
STRIATIONS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION TEMPERATURE