Scaling approach to itinerant quantum critical points
نویسندگان
چکیده
منابع مشابه
Anomalous scaling at the quantum critical point in itinerant antiferromagnets.
We show that the Hertz phi(4) theory of quantum criticality is incomplete as it misses anomalous nonlocal contributions to the interaction vertices. For antiferromagnetic quantum transitions, we found that the theory is renormalizable only if the dynamical exponent z=2. The upper critical dimension is still d=4 - z=2; however, the number of marginal vertices at d=2 is infinite. As a result, the...
متن کاملItinerant density wave instabilities at classical and quantum critical points
The Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA Institute for Theoretical Physics, University of Amsterdam, 1090 GL Amsterdam, The Netherlands H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK Physical Sciences and Engineeri...
متن کاملQuantum critical behavior in disordered itinerant ferromagnets: Logarithmic corrections to scaling
The quantum critical behavior of disordered itinerant ferromagnets is determined exactly by solving a recently developed effective field theory. It is shown that there are logarithmic corrections to a previous calculation of the critical behavior, and that the exact critical behavior coincides with that found earlier for a phase transition of undetermined nature in disordered interacting-electr...
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 Scaling in the Disordered Itinerant Ferromagnet UCo_{1-x}Fe_{x}Ge.
The Belitz-Kirkpatrick-Vojta (BKV) theory shows in excellent agreement with experiment that ferromagnetic quantum phase transitions (QPTs) in clean metals are generally first order due to the coupling of the magnetization to electronic soft modes, in contrast to the classical analogue that is an archetypical second-order phase transition. For disordered metals the BKV theory predicts that the s...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 2004
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.69.172401