Study of spin fluctuations in Ni3Al using point contact Andreev reflection spectroscopy

Details Study of spin fluctuations in Ni3Al using point contact Andreev reflection spectroscopy Study of spin fluctuations in Ni3Al using point contact Andreev reflection spectroscopy

2008-07-19

arxiv.org/abs/0807.3087v1

Appl. Phys. Lett. 93, 102502 (2008)

Physics

Condensed Matter

Superconductivity

ps file with figures

Scientific paper

10.1063/1.2979687

We report point contact Andreev reflection (PCAR) spectroscopy studies on Ni3Al with composition range (24, 26 and 27 at. % of Al in the solid solution) spanning the ferromagnetic to paramagnetic phase boundary. PCAR studies performed using Nb tip as counter electrode reveal that the superconducting quasiparticle lifetime (\tao) and superconducting energy gap (\delta) decreases with increasing spin fluctuation in the normal metal electrode. Our study reveals that PCAR could be a useful probe to study spin fluctuations in systems which are on the verge of a magnetic instability.

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