Acoustic plasmons as a possible cause of the anomalous thermal conductivity peak in high-T{sub c} superconductors below the critical temperature
- Ukrainian Academy of Sciences, Kiev (Ukraine)
It is shown that the anomalies in the temperature dependence of the thermal conductivity {kappa}(T) in high-T{sub c} superconductors below the critical superconducting transition temperature T{sub c} are attributable to the existence of slowly damped Bose-type collective electron excitations with an acoustic dispersion law (acoustic plasmons) within the gap 2{triangle}(T). This {open_quotes}plasmon{close_quotes} heat-conduction mechanism in layered cuprate metal oxide compounds accounts for the anomalous peak of {kappa}(T) in the plane of the CuO{sub 2} layers, the quadratic dependence {kappa}(T) {proportional_to} T{sup 2} for T{much_lt}T{sub c}, the suppression of the maximum of {kappa}(T) at T{approx}T{sub c}/2 by allovalent impurities and a magnetic field, the reversal of the anisotropy of {kappa}(T) in the plane of the layers in single-domain YBa{sub 2}Cu{sub 3}O{sub 7-{epsilon}} crystals with ordered CuO chains in the transition from the normal state to the superconducting state, etc. 52 refs., 4 figs.
- OSTI ID:
- 183641
- Journal Information:
- Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 2 Vol. 81; ISSN JXTPAS; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
Similar Records
Acoustic plasmons and cuprate superconductivity
Acoustic plasmons and conducting carriers in hole-doped cuprate superconductors