Single to Multiquasiparticle Excitations in the Itinerant Helical Magnet CeRhIn5

C. Stock*, J. A. Rodriguez-Rivera, K. Schmalzl, E. E. Rodriguez, A. Stunault, C. Petrovic

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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, J(RKKY) = 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.

Original languageEnglish
Article number247005
Number of pages6
JournalPhysical Review Letters
Volume114
Issue number24
DOIs
Publication statusPublished - 19 Jun 2015

Keywords

  • HIGH-TEMPERATURE SUPERCONDUCTIVITY
  • HEISENBERG-ANTIFERROMAGNET
  • NEUTRON POLARIMETRY
  • HEAVY
  • IRON
  • SCATTERING
  • FERROMAGNET
  • CONTINUUM
  • SYMMETRY
  • CECOIN5

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