Artículos de revistas
Multiband effects in the electron spin resonance of Gd3+ in the intermediate-valence compound YbAl3 and its reference compound LuAl3
Registro en:
Physical Review B. American Physical Soc, v. 75, n. 4, 2007.
1098-0121
WOS:000243895600024
10.1103/PhysRevB.75.045107
Autor
Urbano, RR
Bittar, EM
Pires, MA
Ferreira, LM
Bufaical, L
Rettori, C
Pagliuso, PG
Magill, B
Oseroff, SB
Thompson, JD
Sarrao, JL
Institución
Resumen
Electron spin resonance (ESR) results of Gd3+ in YbAl3 and LuAl3 are analyzed using a multiband (f-, d-, and p-type) model of correlated conduction electrons. The need for a multiband analysis of our results is based on the following observations: (i) the Korringa rates b similar or equal to 14 Oe/K and b similar or equal to 9 Oe/K for Gd3+ for YbAl3 and LuAl3, respectively, are larger than those expected from the respective measured g shifts (Knight shift), and (ii) negative and positive g shifts Delta g similar or equal to-0.004 and Delta g similar or equal to+0.003 were observed for Gd3+ in YbAl3 and LuAl3, respectively. Specific heat and magnetic susceptibility measurements, in the samples studied by ESR, show that electron-electron correlations are present in both compounds. 75 4