The anomalous thermal conductivity of La2-xSrxCuO4-y at very low temperatures
Uher, Ctirad; Cohn, J. L.
1988-09-20
Citation
Uher, C; Cohn, J L (1988). "The anomalous thermal conductivity of La2-xSrxCuO4-y at very low temperatures." Journal of Physics C: Solid State Physics. 21(26): L957-L963. <http://hdl.handle.net/2027.42/49000>
Abstract
The authors report measurements of thermal conductivity ( kappa ) extending to 100 mK on a series of La2-xSrxCuO4-y specimens with 0.10<or=x<or=0.25. For two superconducting samples (x=0.20, x=0.25) the temperature dependence of kappa weakens below about 0.5 K, approaching a variation linear in T near 0.1 K. A non-superconducting sample (x=0.10) exhibits a kappa varies as T3 dependence below 1 K, characteristic of phonon boundary scattering. After annealing in a vacuum, the x=0.20 specimen became insulating and had a thermal conductivity similar in magnitude and temperature dependence to that of the x=0.10 sample. Thus superconducting and non-superconducting samples are clearly distinguished by the behaviour of their thermal conductivities at sub-kelvin temperatures. These results are shown to be consistent with the presence of a small number of free carriers well below Tc in the superconductors. They suggest that a non-superconducting band of electrons is present in the highly doped materials.Publisher
IOP Publishing Ltd
ISSN
0022-3719
Types
Article
Metadata
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