Kondo-lattice behavior and multiple characteristic temperatures in CeIr2Ge2

Mallik, R. ; Sampathkumaran, E. V. ; Paulose, P. L. ; Dumschat, J. ; Wortmann, G. (1997) Kondo-lattice behavior and multiple characteristic temperatures in CeIr2Ge2 Physica B: Condensed Matter, 55 (6). pp. 3627-3630. ISSN 0921-4526

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Official URL: http://prb.aps.org/abstract/PRB/v55/i6/p3627_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.55.3627


The results of electrical-resistivity ρ measurements (1.4-300 K) on the alloys, Ce1-xLaxIr2Ge2 (0≤ x ≤ 1), CeIr2-x(Rh,Pt)xGe2 (x=0.2 and 0.4), and CeIr2Ge2-x(Si,Sn)x (x=0.2 and 0.4), are reported in order to understand the Kondo effect in CeIr2Ge2. There is a significant decrease in ρ as the temperature is lowered from 100 to 4.2 K for x = 0.0. This feature disappears for a small replacement of Ce by La (x = 0.3), thereby resulting in a single-ion Kondo effect for higher values of x. This finding establishes that the temperature Tcoh, characterizing the coherent scattering among the Kondo centers for x=0 is as large as about 100 K. The coherent scattering is not destroyed by small substitutions at the Ir or Ge site. The observed sensitivity of this coherence effect to a small disruption of Ce sublattice periodicity alone by La substitution is uncommon among trivalent Ce alloys. Such a large Tcoh value enables us to emphasize the need to invoke three characteristic temperatures for nonmagnetic Kondo lattices.

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Deposited On:06 Jun 2012 13:45
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