Magnetic penetration depth in electron-doped cuprates - evidence for gap nodes

The in-plane penetration depth λ( T) is measured in electron-doped single crystal Nd 1.85 Ce 0.15 CuO 4− x (NCCO) and Pr 1.85 Ce 0.15 CuO 4− x (PCCO) using an 11 MHz LC resonator. In NCCO, λ( T) exhibits a minimum at 3.8 K and a pronounced upturn down to 0.4 K due to the paramagnetic contribution of...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2000, Vol.341, p.1703-1704
Main Authors: Prozorov, Ruslan, Giannetta, Russell W., Fournier, Patrick, Greene, Richard L.
Format: Article
Language:English
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Summary:The in-plane penetration depth λ( T) is measured in electron-doped single crystal Nd 1.85 Ce 0.15 CuO 4− x (NCCO) and Pr 1.85 Ce 0.15 CuO 4− x (PCCO) using an 11 MHz LC resonator. In NCCO, λ( T) exhibits a minimum at 3.8 K and a pronounced upturn down to 0.4 K due to the paramagnetic contribution of Nd 3+ ions. The London penetration depth contribution is linear in T. The paramagnetic contribution is absent in PCCO, where λ(T)∼T 2 at low temperatures. Our results indicate the presence of nodes in the superconducting gap, i.e., non s-wave symmetry of the order parameter in electron-doped cuprates.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(00)00945-X