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On the Ordering Instability of Weakly-Interacting Electrons in a Dirty Metal | | Chetan Nayak
; Xiao Yang
; | | Date: |
25 Feb 2003 | | Subject: | Disordered Systems and Neural Networks; Strongly Correlated Electrons | cond-mat.dis-nn cond-mat.str-el | | Abstract: | In a dirty metal, electron-electron interactions in the spin-triplet channel lead to singular corrections to a variety of physical quantities. We show that these singularities herald the emergence of ferromagnetism. We calculate the effective action for the magnetic moment of weakly-interacting electrons in a dirty metal and show that a state with finite ferromagnetic moment minimizes this effective action. The saddle-point approximation is exact in an appropriate large-N limit. We discuss the physics of the ferromagnetic state with particular regard to thermal fluctuations and localization effects. | | Source: | arXiv, cond-mat/0302503 | | Services: | Forum | Review | PDF | Favorites | |
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