Spin Fluctuations and Non-Fermi-Liquid Behavior of CeNi₂Ge₂
Kadowaki, H. · Fåk, B. · Fukuhara, T. · Maezawa, K. · Nakajima, K. · Adams, M. A. · Raymond, S. · Flouquet, J.
Original · EN
Neutron scattering shows that non-Fermi-liquid behavior of the heavy-fermion compound CeNi₂Ge₂ is brought about by the development of low-energy spin fluctuations with an energy scale of 0.6 meV. They appear around the antiferromagnetic wave vectors (1/2 1/2 0) and (0 0 3/4) at low temperatures, and coexist with high-energy spin fluctuations with an energy scale of 4 meV and a modulation vector (0.23, 0.23, 1/2). This unusual energy dependent structure of Im χ(Q, E) in Q space suggests that quasiparticle bands are important.
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