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Single to Multiquasiparticle Excitations in the Itinerant Helical Magnet CeRhIn5



C. Stock, Jose Rodriguez Rivera, Karin Schmalzl, E. E. Rodriguez, A. Stunault, C. Petrovic


CeRhIn5 is an itinerant magnet where the Ce3+ spins order in a simple spiral phase caused by competing exchange interactions. 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 states decay into a continuum constrained by kinematics of energy and momentum conservation. CeRhIn5 represents a case where competing interactions results in a breakdown of a single quasiparticle picture for the excitations.
Physical Review Letters


Neutron Scattering, Heavy fermions, magnetic materials


Stock, C. , Rodriguez Rivera, J. , Schmalzl, K. , Rodriguez, E. , Stunault, A. and Petrovic, C. (2015), Single to Multiquasiparticle Excitations in the Itinerant Helical Magnet CeRhIn<sub>5</sub>, Physical Review Letters, [online], (Accessed April 23, 2024)
Created June 18, 2015, Updated October 12, 2021