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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4572

Title: Temperature dependence of transport spin polarization in NdNi(5) from point-contact Andreev reflection
Authors: MUKHOPADHYAY, S
RAYCHAUDHURI, P
JOSHI, DA
TOMY, CV
Keywords: magnetic-properties
ferromagnets
Issue Date: 2007
Publisher: AMER PHYSICAL SOC
Citation: PHYSICAL REVIEW B, 75(1), -
Abstract: We report a study in which point-contact Andreev reflection (PCAR) spectroscopy using a superconducting Nb tip has been carried out on NdNi(5), a ferromagnet with a Curie temperature of T(C)similar to 7.7 K. The measurements were performed over a temperature range of 2-9 K, 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.
URI: http://dx.doi.org/10.1103/PhysRevB.75.014504
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4572
http://hdl.handle.net/10054/4572
ISSN: 1098-0121
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