title: Strongly enhanced magnetic excitations near the quantum critical point of Cr1-xVx and why strong exchange enhancement need not imply heavy fermion behavior.
abstract: Inelastic neutron scattering reveals strong spin fluctuations with energies as high as 0.4 eV in the nearly antiferromagnetic metal Cr0. 95V0.05. The magnetic response is well described by a modified Millis-Monien-Pines function. From the low-energy response, we deduce a large exchange enhancement, more than an order of magnitude larger than the corresponding enhancement of the low-temperature electronic heat capacity gammaT. A scaling relationship between gamma and the inverse of the wave vector-averaged spin relaxation rate gammaave is demonstrated for a number of magnetically correlated metals.
authors.affiliation: H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom.
authors.forename: S M
authors.initials: SM
authors.lastname: Hayden
authors.forename: R
authors.initials: R
authors.lastname: Doubble
authors.forename: G
authors.initials: G
authors.lastname: Aeppli
authors.forename: T G
authors.initials: TG
authors.lastname: Perring
authors.forename: E
authors.initials: E
authors.lastname: Fawcett