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Observation of pseudo-gap and Kondo behaviour in Al70Pd30−xMnx quasicrystals

Banerjee, Gayathri N and Banerjee, S and Goswami, R (2004) Observation of pseudo-gap and Kondo behaviour in Al70Pd30−xMnx quasicrystals. In: 8th International Conference on Quasicrystals, SEP 08-13, 2002, Bangalore, INDIA.

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Official URL: http://dx.doi.org/10.1016/j.jnoncrysol.2003.12.009

Abstract

We report here the electrical and magnetic properties of Al70Pd30−xMnx 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 lnT dependence indicating Kondo-like behaviour. In the point contact spectroscopy studies we observe two regimes showing a V2 dependence at low bias voltages (for V<10 meV) crossing over to the V0.5 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 V2 dependence can also arise due to magnetic scattering effects, which are signatures of the Kondo-like behaviour.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: 61.44.Br;72.15.v;75.50.Kj
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 08 Mar 2012 09:52
Last Modified: 08 Mar 2012 09:52
URI: http://eprints.iisc.ernet.in/id/eprint/43811

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