Charge density wave and large non-saturating magnetoresistance in YNiC2 and LuNiC2
Abstract
We report a study of physical properties of two quasi-low dimensional metals YNiC2 and LuNiC2 including the investigation of transport, magnetotransport, galvanomagnetic and specific heat properties. In YNiC2 we reveal two subsequent transitions associated with the formation of weakly coupled charge density wave at TCDW = 318 K, and its locking in with the lattice at T1 = 275 K. These characteristic temperatures follow the previously proposed linear scaling with the unit cell volume, demonstrating its validity extended beyond the lanthanide-based RNiC2. We also find that, in the absence of magnetic ordering able to interrupt the development of charge density wave, the Fermi surface nesting leads to opening of small pockets, containing high mobility carriers. This effect gives rise to substantial enhancement of magnetoresistance, reaching 470 % for YNiC2 and 50 % for LuNiC2 at T = 1.9 K and B = 9 T.
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