Observation of enhanced fluctuation diamagnetism in lanthanum superconductors with dilute magnetic impurities

Abstract

The fluctuation-induced diamagnetism (FD), 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 the FD agrees, as expected, with the theoretical predictions, it is much larger for La-Pr alloys (around a factor 5 for La-2at.%Pr). These results suggest the existence of an indirect contribution to the FD arising from the interaction between fluctuating Cooper pairs and magnetic impurities.

arXiv comment13 pages, including 2 figures and 1 table. LaTeX

References in corpus (2)

• On the consequences of the uncertainty principle on the superconducting fluctuations well inside the normal state
• Spin screening of magnetic moments in superconductors

Cited by in corpus (3)

• In-plane and transverse superconducting fluctuation diamagnetism in the presence of charge-density waves in 2H-NbSe2 single crystals
• Precursor superconducting diamagnetism in YBa2Cu3O7-d with in-plane or intercalated magnetic impurities
• Magnetic field dependence of the precursor diamagnetism in La superconductors with magnetic Pr impurities