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Observation of pseudo-gap and Kondo behaviour in $Al_{70}Pd_{30-x}Mn_x$ quasicrystals

Banerjee, Gayathri N and Banerjee, S and Goswami, R (2004) Observation of pseudo-gap and Kondo behaviour in $Al_{70}Pd_{30-x}Mn_x$ quasicrystals. In: Journal of Non-Crystalline Solids, 334-33 . pp. 388-392.

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We report here the electrical and magnetic properties of $Al_{70}Pd_{30-x}Mn_x$ quasicrystals (x = 9 and 11), from resistivity and point contact spectroscopy measurements. Electrical resistivity shows a resistivity maximum for both of these compositions. The positive TCR at lower temperature is attributed to spin–orbit scattering. For x = 11, we observe an upturn in the resistivity below 20 K, which follows a ln T dependence indicating Kondo-like behaviour. In the point contact spectroscopy studies we observe two regimes showing a $V^2$ dependence at low bias voltages (for V < 10 meV) crossing over to the $V^{0.5}$ dependence at higher voltages. This is attributed to the signature of a pseudo-gap in the density of states at zero bias. We suggest that this $V^2$ dependence can also arise due to magnetic scattering effects, which are signatures of the Kondo-like behaviour.

Item Type: Journal Article
Publication: Journal of Non-Crystalline Solids
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 30 Nov 2007
Last Modified: 19 Sep 2010 04:35
URI: http://eprints.iisc.ac.in/id/eprint/10125

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