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Point contact spectroscopy of $Al_7_0 Pd_3_0_-_x Mn_x$ quasicrystals

Banerjee, Gayathri N and Banerjee, S and Goswami, R (2003) Point contact spectroscopy of $Al_7_0 Pd_3_0_-_x Mn_x$ quasicrystals. In: Journal of Physics: Condensed Matter, 15 (14). pp. 2317-2326.

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Abstract

We report here the electrical resistivity and point contact spectroscopy (PCS) of $Al_7_0 Pd_3_0_-_x Mn_x$ Mnx quasicrystals (x = 7, 9 and 11). All samples show a negative temperature coefficient of resistivity (TCR) at room temperature and a positive TCR below 100 K giving rise to resistivity maxima. The positive TCR at lower temperature is attributed to spin–orbit scattering. For x = 11, we observe an upturn with a sharp rise in the resistivity below 20 K and ln T dependence of resistivity is observed below 10 K indicating Kondo-like behaviour. In the PCS we are able to see evolution of the point contact regime to the tunnelling-like regime as a function of contact resistance. We see the signature of the Kondo effect in the PCS. In this spectroscopy we observe three regimes showing a $V^n$ dependence where n ~ 1.7 at low bias voltages (for V < 10 meV) crossing over to n ~ 0.5 at higher voltages and to n ~ 2 above 60 meV.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 02 Jun 2006
Last Modified: 19 Sep 2010 04:28
URI: http://eprints.iisc.ernet.in/id/eprint/7336

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