Abstract. The thermal expansion of a single crystal of the intermetallic compound CeNiSn has been measured at low temperatures 0.3 K < T< 12 K and in a magnetic field up to 8 T. A large anisotropy of the linear expansion is observed which is strongly influenced by the magnetic field. These data are interpreted within the theory explaining the origin of the quasigap in the heavy fermion spectrum of CeNiSn by the interplay between the heavy fermions and low-energy excitations in non-cubic Kondo lattices.
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