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

Journal Article · Mon Nov 01 00:00:00 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, Vol. 60, Issue 18; Other Information: PBD: Nov 1999
• Country of Publication: United States
• Language: English

Related Subjects

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