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Abstract:
The formation of the pseudogap in CeNiSn has been investigated by means
of resistivity and specific-heat measurements in high magnetic fields.
When the field is raised from 0 to 12 T along the orthorhombic a axis,
the semiconductorlike behavior in the resistivity below 6 K disappears
and the linear electronic term in the specific heat increases from 57 to
100 mJ/K2mol. However, no significant effect was observed for fields
along the b and c axes up to 15 T. These results suggest an anisotropic
suppression of the pseudogap, which can be interpreted as a result of
strong spin polarization of the renormalized narrow band.
