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Temperature dependence of transport spin polarization in NdNi(5) from point-contact Andreev reflection

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Title Temperature dependence of transport spin polarization in NdNi(5) from point-contact Andreev reflection
 
Creator MUKHOPADHYAY, S
RAYCHAUDHURI, P
JOSHI, DA
TOMY, CV
 
Subject magnetic-properties
ferromagnets
 
Description 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.
 
Publisher AMER PHYSICAL SOC
 
Date 2011-07-17T00:34:41Z
2011-12-26T12:50:02Z
2011-12-27T05:35:57Z
2011-07-17T00:34:41Z
2011-12-26T12:50:02Z
2011-12-27T05:35:57Z
2007
 
Type Article
 
Identifier PHYSICAL REVIEW B, 75(1), -
1098-0121
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
 
Language en