Collective excitations below {Tc} in cuprate superconductors
- Jiwaji Univ. (India). School of Studies in Physics
The authors present a theoretical study of frequency and line shape for collective excitation of charge carriers below {Tc} for cuprate superconductors like La{sub 2{minus}x}Sr{sub x}CuO{sub 4} and like YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, using layered electron gas model. The collective excitations are studied in the frequency range {Dirac_h}{omega} {le} 2{Delta} {le} qv{sub F} < T < {Tc}, where {Delta}, q, v{sub F} and T are respectively the component of wave vector in a-b plane, binding energy of Cooper pair, Fermi velocity and the temperature. The polarizability for a two dimensional fluid comprising of paired as well as unpaired electrons is calculated and used to calculate the imaginary part of inverse dielectric response function, which gives rise to the frequency and line shapes of collective excitations. The plasmon line shapes of a layered electron gas are found very similar in nature to that of three dimensional electron gas below {Tc}.
- OSTI ID:
- 82831
- Report Number(s):
- CONF-940142--; ISBN 0-8194-1452-2
- Country of Publication:
- United States
- Language:
- English
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