Tanner, D. B. and Gao, F. and Kamarás, Katalin (2000) Superfluid and normal-fluid densities in the high-Tc superconductors. PHYSICA C - SUPERCONDUCTIVITY AND ITS APPLICATIONS, 341-48. pp. 2193-2196. ISSN 0921-4534
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Abstract
In clean metallic superconductors, 100% of the mobile carriers participate ill the condensate, so that the London penetration depth (which measures the electromagnetic screening by the superconductor) indicates charge densities comparable to those inferred from the free-carrier plasma frequency. In the cuprates, this is not the case, even though penetration depth measurements have shown a good correlation between superfluid density and superconducting transition temperature in the underdoped-to-optimally-doped part of the phase diagram. Optical measurements, which permit independent determination of the total doping-induced spectral weight and the superfluid density, show that in optimally doped materials only about 20% of the doping-induced spectral weight joins the superfluid. The rest remains in finite-frequency, midinfrared absorption. In underdoped materials, the superfluid fraction is even smaller. This result implies extremely strong coupling for these superconductors.
Item Type: | Article |
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Additional Information: | International Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI. FEB 20-25, 2000., HOUSTON, TEXAS. Part 4 |
Subjects: | Q Science / természettudomány > QC Physics / fizika |
SWORD Depositor: | MTMT SWORD |
Depositing User: | MTMT SWORD |
Date Deposited: | 01 Aug 2013 08:25 |
Last Modified: | 01 Aug 2013 08:25 |
URI: | http://real.mtak.hu/id/eprint/6128 |
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