Quantum critical behavior in itinerant electron systems: Eliashberg theory and instability of a ferromagnetic quantum critical point
نویسندگان
چکیده
منابع مشابه
Instability of the quantum-critical point of itinerant ferromagnets.
We study the stability of the quantum-critical point for itinerant ferromagnets commonly described by the Hertz-Millis-Moriya (HMM) theory. We argue that in D</=3 long-range spatial correlations associated with the Landau damping of the order parameter field generate a universal negative, nonanalytic |q|((D+1)/2) contribution to the static magnetic susceptibility chi(s)(q,0), which makes HMM th...
متن کاملQuantum critical behavior in disordered itinerant ferromagnets: Instability of the ferromagnetic phase
An effective field theory is derived, which describes the quantum critical behavior of itinerant ferromagnets, as the transition is approached from the ferromagnetic phase. This complements a recent study of the critical behavior on the paramagnetic side of the phase transition, and investigates the role of the ferromagnetic Goldstone modes near criticality. We find that the Goldstone modes hav...
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Quantum phase transitions occur at zero temperature as a function of some non-thermal parameter, e.g., pressure or chemical composition. In addition to being of fundamental interest, quantum phase transitions are important because they are believed to underlie a number of interesting low temperature phenomena. Quantum phase transitions differ from the classical phase transitions in many importa...
متن کاملQuantum critical behavior of itinerant ferromagnets
We investigate the quantum phase transition of itinerant ferromagnets. It is shown that correlation effects in the underlying itinerant electron system lead to singularities in the order parameter field theory that result in an effective long-range interaction between the spin fluctuations. This interaction turns out to be generically antiferromagnetic for clean systems. In disordered systems a...
متن کاملQuantum Critical Point of Itinerant Antiferromagnet in Heavy Fermion
H. Kadowaki, Y. Tabata, M. Sato, N. Aso, S. Raymond, and S. Kawarazaki Department of Physics, Tokyo Metropolitan University, Hachioji-shi, Tokyo 192-0397, Japan Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan MSD, JASRI, 1-1-1 Kouto Mikazuki-cho Sayo-gun, Hyogo 679-5198, Japan NSL, Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Jap...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2006
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.74.195126