title: Magnitude of the magnetic exchange interaction in the heavy-fermion antiferromagnet CeRhIn₅.
abstract: We have used high-resolution neutron spectroscopy experiments to determine the complete spin wave spectrum of the heavy-fermion antiferromagnet CeRhIn₅. The spin wave dispersion can be quantitatively reproduced with a simple frustrated J₁-J₂ model that also naturally explains the magnetic spin-spiral ground state of CeRhIn₅ and yields a dominant in-plane nearest-neighbor magnetic exchange constant J₀=0.74(3)  meV. Our results pave the way to a quantitative understanding of the rich low-temperature phase diagram of the prominent CeTIn₅ (T=Co, Rh, Ir) class of heavy-fermion materials.
authors.affiliation: Condensed Matter and Magnet Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Pinaki
authors.initials: P
authors.lastname: Das
authors.affiliation: T-4, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: S-Z
authors.initials: SZ
authors.lastname: Lin
authors.affiliation: Condensed Matter and Magnet Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: N J
authors.initials: NJ
authors.lastname: Ghimire
authors.affiliation: Condensed Matter and Magnet Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA and Department of Physics, University of California, San Diego, La Jolla, California 92093, USA.
authors.forename: K
authors.initials: K
authors.lastname: Huang
authors.affiliation: Condensed Matter and Magnet Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: F
authors.initials: F
authors.lastname: Ronning
authors.affiliation: Condensed Matter and Magnet Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: E D
authors.initials: ED
authors.lastname: Bauer
authors.affiliation: Condensed Matter and Magnet Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Thompson
authors.affiliation: T-4, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: C D
authors.initials: CD
authors.lastname: Batista
authors.affiliation: Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6475, USA.
authors.forename: G
authors.initials: G
authors.lastname: Ehlers
authors.affiliation: Condensed Matter and Magnet Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: M
authors.initials: M
authors.lastname: Janoschek