title: Field-dependent energy scales in URu(2)Si(2).
abstract: At low temperature, macroscopic properties of URu(2)Si(2) display a characteristic energy scale delta(0)(B) which decreases when a magnetic field is applied, and eventually vanishes at an extrapolated value of the field of about 40 T. We have performed inelastic neutron scattering measurements of the magnetic dynamics of URu(2)Si(2) in applied fields along the c axis of intensities up to 12 T. We show that delta(0)(B) is not related to gaps in the magnetic fluctuations spectra. This provides direct evidence of the fact that two distinct energy scales govern the physics of this compound.
authors.affiliation: Oxford Physics, Clarendon Laboratory, Oxford OX1 3PU, United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: Santini
authors.forename: G
authors.initials: G
authors.lastname: Amoretti
authors.forename: R
authors.initials: R
authors.lastname: Caciuffo
authors.forename: F
authors.initials: F
authors.lastname: Bourdarot
authors.forename: B
authors.initials: B
authors.lastname: Fåk