Temperature dependence of transport spin polarization in NdNi5 from point-contact Andreev reflection
Sourin Mukhopadhyay, Pratap Raychaudhuri, Devang A. Joshi, C. V. Tomy
DOI 10.1103/PhysRevB.75.014504 · Physical Review B
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Abstract
We report a study in which point-contact Andreev reflection (PCAR) spectroscopy using a superconducting Nb tip has been carried out on NdNi5, a ferromagnet with a Curie temperature of TC∼7.7K. The measurements were performed over a temperature range of 2–9K, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.2 | Pressure not reported | unknown |
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