By Arioli G., Szulkin A.

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In fields higher than 1 T, a ferromagnetic state is induced. The comparison with the resistivity behavior for current within the basal plane (ilc, in H = 0) illustrates the effect of ferromagnetic coupling of the uranium moments within the basal plane UNiGa. Overtaken from Havela et al. (1996a). magnetic phase transitions, and finally the resistivity decreases at low temperatures. However, the residual resistivity p0 is much higher (140 ~t~2cm) for iHc than for i l c . The high resistivity is removed in the ferromagnetic state.

This approach leads to distinct spectral features related to the Kondo (Abrikosov-Suhl) resonance in the vicinity of EF. One of characteristics of these features is an anomalously strong temperature dependence. However, it was shown for cerium heavy-fermion compounds, that such temperature dependence is most probably absent and does not show the development expected from variation of the Kondo temperature (Joyce et al. 1992; Arko et al. 1997a). Moreover, ARPES data show a distinct dispersion of the states at EF, which proves that they must be band states and cannot be treated as isolated impurities (Arko et al.

1997) [36] Tran et al. (1995b) [37] Mirambet et al. (1995a) [38] Palstra et al. (1987) [39] Buschow et al. (1985a) [401 Dwight (1974) [41] Kergadallan (1993) T h e U a t o m s o c c u p y t h e M g sites w h e r e a s t r a n s i t i o n m e t a l a n d p - e l e m e n t a t o m s a r e r a n d o m l y d i s t r i b u t e d o v e r t h e t w o Z n sites. T h e U a t o m s a r e a r r a n g e d w i t h i n t h e b a s a l p l a n e in s l i g h t l y b u c k l e d l a y e r s s e p a r a t e d b y T X l a y e r s .

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