| Autor: |
Pires, M. A., Ferreira, L. Mendonça, Duque, J. G. S., Urbano, R. R., Agüero, O., Torriani, I., Rettori, C., Bittar, E. M., Pagliuso, P. G. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 4/15/2006, Vol. 99 Issue 8, p08J311, 3p, 3 Graphs |
| Abstrakt: |
We have synthesized single crystalline samples of Gd3Co4Sn13 intermetallic compound using a Sn-flux method. This compound crystallizes with a cubic Yb3Co4Sn13-type structure, space group Pm-3n, which has 40 atoms per unit cell. Measurements of the magnetic susceptibility, heat capacity, electrical resistivity, and electron spin resonance (ESR) revealed that Gd3Co4Sn13 is a metallic Curie-Weiss paramagnet at high temperature and presents an antiferromagnetic ordering below TN=14.5 K. In the paramagnetic state, a single Gd3+ ESR line with a nearly temperature independent g∼2.005(2) is observed, and its linewidth follows a Korringa-like behavior as a function of temperature. From the Korringa rate (ΔH/ΔT∼4 Oe/K) and g-shift (Δg∼0.012) obtained from the ESR experiments combined with the magnetic susceptibility and specific heat data for Gd3Co4Sn13, we have extracted the exchange parameters between the Gd3+ local moments and the conduction-electrons (c-e) in this compound. This exchange parameter Jfs≈10 meV was found to be c-e wave-vector independent and the electronic structure of Gd3Co4Sn13 has a single band character. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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