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2 Materials Science Poland

2 2008

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Electronic structure of CePdAl; experiment and calculations

Głogowski W., Goraus J., Ślebarski A.

Materials Science Poland

2008

Vol. 26, No. 3

729--734

CePdAl exhibits an antiferromagnetic phase below TN = 2.7 K; its physical properties are typical of heavy fermion compounds (specific heat coefficient γ= C/T = 270 mJ/(mol�EK2)). The triangular coordination symmetry of the magnetic Ce ions gives rise to geometrical frustration and leads to an incommensurate antiferromagnetic structure below TN, showing a coexistence of ordered and frustrated Ce moments. The purpose of this work was to discuss electronic structure of CePdAl and its influence on the geometrical frustration in the Kagome-like lattice and the Kondo effect in CePdAl. We present the results of the X-ray diffraction analysis and the XPS Ce 3d core and valence band spectra. We also present the spinpolarized band structure calculations for CePdAl, using the LAPW method.

Effect of randomness on anomalous Hall coefficient in antiferromagnet U2PdGa3

Tran V H

Materials Science Poland

2008

Vol. 26, No. 4

1069--1075

The Hall effect has been studied for antiferromagnet U2PdGa3. In the paramagnetic state, the Hall data can be interpreted in terms of skew scattering theory for heavy-fermion systems. We observe a large contribution of anomalous Hall coefficient, indicating a dominated contribution of incoherent skew scattering by uranium 5f moments. Interesting behaviour of the RH(T) dependence is found at low temperatures. The RH(T) curve displays a plateau between T* = 12 and TN = 33 K, followed by a shoulder with further decreasing temperature. The appearance of the anomaly around T* suggests the existence of a new scattering mechanism, in addition to well known skew and jump-side scatterings. We compare the Hall data of U2PdGa3 with those observed for strongly correlated electron systems and with those of spin-glasses. Like the latter systems, non-zero spin chirality seems to play a considerable role in the anomalous Hall effect of U2PdGa3.