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

Sourin Mukhopadhyay; Sudesh Kumar Dhar; Pratap Raychaudhuri

doi:10.1063/1.2979687

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

Superconductivity 2009-10-11 v1 Materials Science

Authors: Sourin Mukhopadhyay , Sudesh Kumar Dhar , Pratap Raychaudhuri

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Abstract

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.

Keywords

andreev reflection

Cite

@article{arxiv.0807.3087,
  title  = {Study of spin fluctuations in Ni3Al using point contact Andreev reflection spectroscopy},
  author = {Sourin Mukhopadhyay and Sudesh Kumar Dhar and Pratap Raychaudhuri},
  journal= {arXiv preprint arXiv:0807.3087},
  year   = {2009}
}

Comments

ps file with figures

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