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Scattering on Spin Fluctuations in Itinerant Quantum Disordered Ferromagnets near the Quantum Phase Transition
Author(s) -
Skryabin Yu.N.,
Chukin A. V.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199910)215:2<1137::aid-pssb1137>3.0.co;2-k
Subject(s) - condensed matter physics , physics , scattering , ferromagnetism , electron , neutron scattering , spin (aerodynamics) , weak localization , quantum phase transition , quantum critical point , quantum fluctuation , phase transition , quantum , magnetic field , quantum mechanics , magnetoresistance , thermodynamics
Taking into account the long‐ranged spin interactions due to weak localization effects in disordered itinerant ferromagnets the scattering of both electrons and neutrons on critical spin fluctuations near the quantum phase transition is considered. It is shown that for the case of low electron density, when k F ξ ≪ 1, where k F is the Fermi momentum and ξ is the magnetic correlation length, the transport cross section of electrons is proportional to the magnetic susceptibility as for the case of scattering by conventional critical fluctuations in absence of weak localization effects. However, the intensity of the multiple small‐angle neutron scattering becomes exponentially small as compared with the intensity of the multiple scattering by conventional critical fluctuations.