Volume 73, Number 4, February 2006
|Page(s)||587 - 593|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||11 January 2006|
Observation of enhanced fluctuation diamagnetism in lanthanum superconductors with dilute magnetic impurities
Laboratorio de Baixas Temperaturas e Superconductividade, Departamento de Física da Materia Condensada, Universidade de Santiago de Compostela - E-15782 Spain
Accepted: 7 December 2005
The fluctuation-induced diamagnetism , associated with the presence of precursor Cooper pairs in the normal state, has been measured in lanthanum with dilute magnetic (Pr) and nonmagnetic (Lu) impurities. It is found that while for pure La and La-Lu alloys agrees, as expected, with the predictions based on the conventional Gaussian-Ginzburg-Landau approach, it is much larger for La-Pr alloys (around a factor 5 for La-2 at.%Pr). These results suggest the existence of an indirect contribution to arising from the interaction between fluctuating Cooper pairs and magnetic impurities.
PACS: 74.25.Ha – Magnetic properties / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
© EDP Sciences, 2006
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