Electronic Raman scattering in the single-CuO{sub 2} layered superconductor Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}}

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.1223· OSTI ID:470855

Gasparov, L V ^[1]; Lemmens, P; Brinkmann, M ^[1]; Kolesnikov, N N ^[2]; Guentherodt, G ^[1]

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1. 2. Physikalisches Institut, Rheinisch-Westfaelische Technische Hochschull Aachen, 52056 Aachen (Germany)
2. Institute for Solid State Physics 142432, Chernogolovka, Moscow district (Russia)

Electronic Raman scattering in Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} (Tl-2201) has been investigated in order to test whether the scattering cross section in high-temperature superconductors depends on the number of CuO{sub 2} planes, i.e., sheets or specific details of the Fermi surface. The polarized Raman spectra have been measured in different scattering geometries for temperatures above and below T{sub c}. The spectral features of Tl-2201 with one CuO{sub 2} plane per unit cell are found to be similar to Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10} with three CuO{sub 2} planes and those of other high-temperature superconductors with several CuO{sub 2} planes per unit cell. The peak in the B{sub 1g} symmetry component of the scattering intensity is found at 460 cm{sup {minus}1}(T{sub c}=90 K), or 430 cm{sup {minus}1}(T{sub c}=80 K). The B{sub 1g} peak positions scale with T{sub c}, and correspond to 2{Delta}/k{sub B}T{sub c}=7.6{plus_minus}0.4. The temperature dependence of the B{sub 1g} scattering component of Tl-2201 (T{sub c}=80 and 90 K) reveals a deviation from BCS behavior. The experimental data are in qualitative agreement with the calculations of Devereaux and Einzel based on the d{sub x{sup 2}{minus}y{sup 2}}-wave symmetry of the order parameter used in the description of the Raman-scattering cross section. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 470855
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
D WAVES
HIGH-TC SUPERCONDUCTORS
ORDER PARAMETERS
PAIRING INTERACTIONS
RAMAN SPECTRA
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
THALLIUM OXIDES