Naslov
Unusual behaviour of the Kondo temperatures in YbAgxIn1-xCu4

Autori
Očko, Miroslav ; Sarrao, John, Luis ; Bauer, Eric ; Šimek, Željko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
International Conference on Magnetism (Abstracts) / Foglia, S ; Ianni, P. ; Testa, A.M. - Rim, 2003

Skup
International Conference

Mjesto i datum
Rim, Italija, 27.07.2003. - 01.08.2003

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
YbAgxIn1-xCu4; Kondo temperature

Sažetak
We have found that the temperature of the thermopower minimum of the YbIn1-xAg-xCu4 alloy system (x >= 0.5) shows the same concentration dependence as the Kondo temperature extracted from susceptibility measurements. However, in average these temperatures are about four times smaller than the Kondo temperatures. The resistivity data indicate that the Kondo temperature of the lowest lying ground state level, TKl, increases with x what is an unexpected behavior for the Yb+3 ion since the lattice constant decreases with x. On contrary, the Kondo temperature of the all ground state levels, TKh, decreases with increasing x for x > 0.5. We discuss these unusual experimental facts and suggest possible explanations. In addition we show that the thermopower data of YbIn1-xAgxCu4 clearly demonstrate the effect of coherence on thermopower for x = 1.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA