Anisotropic transport properties of NpPdAl

Matsuda, Tatsuma; Haga, Yoshinori   ; Aoki, Dai*; Homma, Yoshiya*; Tateiwa, Naoyuki   ; Yamamoto, Etsuji  ; Onuki, Yoshichika

The anisotropic superconductor NpPdAl with ZrNiAl-type tetragonal structure was studied by means of electrical resistivity and Hall effect in the normal state. The temperature dependence of electrical resistivity shows a large anisotropic behavior. The resistivity for [001] is larger than that for [100] in the whole temperature region. At high temperatures is proportional to , which is characteristic behavior in Kondo effect. The field dependence of Hall resistivity shows a linear dependence up to 55 kOe with a large slope for the field. The slope of for field along -axis is negative, but for field along -axis, the slope dramatically changed from negative to positive with increasing temperature.