%0 Journal Article
%A Stock, C.
%A Rodriguez-Rivera, J. A.
%A Schmalzl, K.
%A Rodriguez, E. E.
%A Stunault, A.
%A Petrovic, C.
%T Single to Multiquasiparticle Excitations in the Itinerant Helical Magnet CeRhIn $_{5}$
%J Physical review letters
%V 114
%N 24
%@ 1079-7114
%C College Park, Md.
%I APS
%M FZJ-2015-04672
%P 247005
%D 2015
%X CeRhIn5 is an itinerant magnet where the Ce3+ spins order in a simple helical phase. We investigate the spin excitations and observe sharp spin waves parameterized by a nearest-neighbor exchange, JRKKY=0.88±0.05  meV. At higher energies, the spin fluctuations are heavily damped, where single-quasiparticle excitations are replaced by a momentum- and energy-broadened continuum constrained by kinematics of energy and momentum conservation. The delicate energy balance between localized and itinerant characters results in the breakdown of the single-quasiparticle picture in CeRhIn5.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000356484700004
%R 10.1103/PhysRevLett.114.247005
%U https://juser.fz-juelich.de/record/202458