Physics – Condensed Matter – Superconductivity
Scientific paper
2006-08-09
PHYSICAL REVIEW B 75, 014504 (2007)
Physics
Condensed Matter
Superconductivity
pdf file including figures-Typographical error and errors in references corrected
Scientific paper
10.1103/PhysRevB.75.014504
We report a study in which Point contact Andreev reflection (PCAR) spectroscopy using superconducting Nb tip has been carried out on NdNi5, a ferromagnet with a Curie temperature of TC~7.7K. The measurements were carried out over a temperature range of 2-9K which spans across the ferromagnetic transition temperature. From an analysis of the spectra, we show that (i) the temperature dependence of the extracted value of transport spin polarization closely follows the temperature dependence of the spontaneous magnetization; (ii) the superconducting quasiparticle lifetime shows a large decrease close to the Curie temperature of the ferromagnet. We attribute the latter to the presence of strong ferromagnetic spin fluctuations in the ferromagnet close to the ferromagnetic transition temperature.
Joshi Devang A.
Mukhopadhyay Sourin
Raychaudhuri Pratap
Tomy C. V.
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