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Type: Artigo de periódico
Title: Unusual behavior of the Kondo temperature of La1-xYbxCu3Al2
Author: Rojas, DP
Cardoso, LP
Coelho, AA
Gandra, FG
Medina, AN
Abstract: Electrical-resistivity (rho), specific-heat (c), and magnetization (M) measurements were carried out for the series of compounds La1-xYbxCu3Al2(O less than or equal tox less than or equal to1). The resistivity results show two regions with a -1n T behavior, with different slopes that allows an estimation of the crystal-field (CF) splitting. Starting at x = 1, the susceptibility is reduced to x = 0.4, and this can be explained by the CF effect. Using the specific-heat and magnetic-susceptibility data, we were able to determine the Kondo temperature (T-K), the crystal-field splitting, and the Debye temperature (theta (D)) for the whole series. T-K was found to increase with the Yb concentration and with the corresponding unit-cell volume contraction. This behavior suggests the increase of the product \Jn(E-f)\ when the volume is reduced. This is the same trend found in Ce compounds, which is unusual for Yb compounds.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.63.165114
Date Issue: 2001
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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