Study of spin fluctuations in Ni3±xAl1∓x using point contact Andreev reflection spectroscopy

Mukhopadhyay, Sourin; Dhar, Sudesh Kumar; Raychaudhuri, Pratap
September 2008
Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p102502
Academic Journal
We report point contact Andreev reflection (PCAR) spectroscopy studies on Ni3±xAl1∓x with composition range spanning the ferromagnetic to paramagnetic phase boundary. PCAR studies performed using Nb tip as counterelectrode reveal that the superconducting quasiparticle lifetime (τ) and superconducting energy gap (Δ) decrease 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 that are on the verge of magnetic instability.


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