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Anderson-Mott Transition Driven by Spin Disorder: Spin Glass Transition and Magnetotransport in Amorphous GdSi | | Pinaki Majumdar
; Sanjeev Kumar
; | | Date: |
25 Sep 2002 | | Journal: | Phys. Rev. Lett. vol 90, 237202 (2003) | | Subject: | Strongly Correlated Electrons; Disordered Systems and Neural Networks | cond-mat.str-el cond-mat.dis-nn | | Abstract: | A zero temperature Anderson-Mott transition driven by spin disorder can be `tuned’ by an applied magnetic field to achieve colossal magnetoconductance. Usually this is not possible since spin disorder by itself cannot localise a high density electron system. However, the presence of strong structural disorder can realise this situation, self consistently generating a disordered magnetic ground state. We explore such a model, constructed to understand amorphous GdSi, and highlight the emergence of a spin glass phase, Anderson-Mott signatures in transport and tunneling spectra, and unusual magneto-optical conductivity. We solve a disordered strong coupling fermion-spin-lattice problem essentially exactly on finite systems, and account for all the qualitative features observed in magnetism, transport, and the optical spectra in this system. | | Source: | arXiv, cond-mat/0209579 | | Other source: | [GID 39512] pmid12857286 | | Services: | Forum | Review | PDF | Favorites | |
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