Non-Fermi-liquid behavior and anomalous suppression of Landau damping in layered metals close to ferromagnetism
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We analyze the low-energy physics of nearly ferromagnetic metals in two spatial dimensions using the functional renormalization group technique. We find a new low-energy fixed point, at which the fermionic (electronlike) excitations are non-Fermi-liquid (zƒ=13/10) and the magnetic fluctuations exhibit an anomalous Landau damping whose rate vanishes as Γq∼|q|3/5 in the low-|q| limit. We discuss this renormalization of the Landau-damping exponent, which is the major novel prediction of our work, and highlight the possible link between that renormalization and neutron-scattering data on UGe2 and related compounds. Implications of our analysis for YFe2Al10 are also discussed.
Ridgway , S & Hooley , C 2015 , ' Non-Fermi-liquid behavior and anomalous suppression of Landau damping in layered metals close to ferromagnetism ' Physical Review Letters , vol 114 , no. 22 , 226404 . DOI: 10.1103/PhysRevLett.114.226404
Physical Review Letters
© 2015 American Physical Society. Reproduced in accordance with the publisher's author self-archiving policy. Originally published in Physical Review Letters here: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.226404#fulltext
Financial support from the EPSRC (U.K.) under Grants No. EP/G03673X/1 (S. P. R.) and No. EP/I031014/1 (C. A. H.) is acknowledged.
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