Abstract
We report measurement of transport spin polarization ( P t ) using point contact Andreev reflection (PCAR) spectroscopy on NdNi 5, a ferromagnet with Curie temperature of T Curie ∼ 7.7 K , using superconducting Nb tip ( T C ∼ 9.2 K ) . Detail analysis of the spectra shows that the normalized value of P t ( = P t ( T ) / P t ( T = 0 ) ) for contacts with different Z follows closely the temperature variation of spontaneous magnetization, though the value of P t decreases with increasing Z. We also observe a large decrease in superconducting quasiparticle lifetime arising from critical spin fluctuations close to the Curie temperature of the ferromagnet.
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