Non-Fermi-Liquid Effects at Ambient Pressure in a Stoichiometric Heavy-Fermion Compound with Very Low Disorder: CeNi2Ge2
Abstract
Pronounced non-Fermi-liquid (NFL) effects in thermodynamic \(C,α\) and transport \(ρ\) properties at ambient pressure \(p\) and zero field are reported for high-purity samples of the undoped heavy-fermion compound CeNi2Ge2. The origin of the NFL effects is not yet clear. Novel phase transitions are observed at both finite and ambient pressure. Under p = 1.7 GPa, a novel, perhaps spin-density-wave-type, phase transition occurs at Tm = 0.9 K. At p = 0, incipient superconductivity below T = 100 mK is found in the two samples with lowest residual resistivities, ρ0<0.45 μΩ cm.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 1999
- DOI:
- 10.1103/PhysRevLett.82.1293
- Bibcode:
- 1999PhRvL..82.1293G