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.
Observation_of_pseudo.pdf - Published Version
Restricted to Registered users only
Download (296Kb) | Request a copy
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.|
|Department/Centre:||Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)|
|Date Deposited:||08 Mar 2012 09:52|
|Last Modified:||08 Mar 2012 09:52|
Actions (login required)