Quantum critical phenomena in undoped heavy-fermion metals

Steglich, F.; Buschinger, B.; Gegenwart, P.; Lohmann, M.; Helfrich, R.; Langhammer, C.; Hellmann, P.; Donnevert, L.; Thomas, S.; Link, A.; Geibel, C.; Lang, M.; Sparn, G.; Assmus, W.

doi:10.1088/0953-8984/8/48/016

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Quantum critical phenomena in undoped heavy-fermion metals

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Steglich, F., Buschinger, B., Gegenwart, P., Lohmann, M., Helfrich, R., Langhammer, C., et al. (1996). Quantum critical phenomena in undoped heavy-fermion metals. Journal of Physics: Condensed Matter, 8(48), 9909-9921. doi:10.1088/0953-8984/8/48/016.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-E7F3-E

Abstract

We present results of low-temperature calorimetric and resistive measurements on the isostructural heavy-fermion compounds CeCu2Si2 and CeNi2Ge2. 'Non-Fermi-liquid' effects are established which suggest the nearness of an antiferromagnetic quantum critical point (QCP) in both systems. The observed deviations from the properties of a Landau Fermi liquid (FL) may be related to anomalous energy dependences of both the quasiparticle mass and the quasiparticle-quasiparticle scattering cross section. For CeNi2Ge2, a moderately heavy FL can be recovered by application of moderate values of either magnetic field or hydrostatic pressure. For p = 1.7 GPa a novel, non-superconducting, phase transition has been discovered at T-1 similar or equal to 1 K.