Interplay of atomic randomness and Kondo effect in disordered metallic conductor La2NiSi3

Daniel Gnida, Maria Szlawska, Przemysław Swatek, Dariusz Kaczorowski

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Abstract

A polycrystalline sample of La2NiSi3 was investigated by means of heat capacity, magnetic susceptibility, magnetization, electrical resistivity and magnetoresistivity measurements. The compound was basically characterized as a Pauli paramagnet with metallic-like electrical conductivity, notably reduced in magnitude and weakly temperature dependent, as is usually observed for atomically disordered systems. Furthermore, the experimental data revealed the presence of a small amount of paramagnetic impurities. As a result, the low-temperature electrical resistivity in La2NiSi3 was found to be governed by both quantum corrections due to electron-electron interactions ( contribution) and spin-flip Kondo scattering ( contribution). The presence of paramagnetic impurities led to an increase in s-electron spin splitting due to the s-d interactions, manifested by a B 1/2 dependence of the magnetoresistivity, anomalously observed in the present study for thermal energy being larger than the Zeeman splitting energy .

Original languageEnglish (US)
Article number435602
JournalJournal of Physics Condensed Matter
Volume28
Issue number43
DOIs
StatePublished - Sep 7 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 IOP Publishing Ltd.

Keywords

  • disorder
  • Kondo effect
  • magnetotransport properties
  • quantum interference

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