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Mar 20 – 23, 2023
Campus Garching
Europe/Berlin timezone

Composition of magnetic interactions in the heavy-fermion system CeIn3

Mar 22, 2023, 12:10 PM
MW 2 001 - Lecture hall (Fakultät für Maschinenwesen)

MW 2 001 - Lecture hall

Fakultät für Maschinenwesen

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Talk (17 + 3 min) Magnetism, Superconductivity, Topological Systems, Magnetic Thin Films an other electronic phenomena Superconductors


Wolfgang Simeth


We report high-resolution neutron spectroscopy on the archetypal heavy fermion material CeIn3 that exhibits an antiferromagnetic (AFM) order below TN= 10.1 K. Increasing pressure suppresses the AFM state to zero temperature resulting in a quantum critical point, the critical fluctuations of which are believed to mediate unconventional superconductivity. Previous neutron results with moderate resolution reported a substantial spin gap of about 1 meV, which suggest a substantial magnetic anisotropy, in contrast to the observed bulk properties. Our results unambiguously demonstrate that CeIn3 does not exhibit a spin gap. Instead, we find that the spin waves disperse quasi-vertically up to almost 1 meV. We show that via ab-initio band structure calculations fed into the multi-orbital periodic Anderson model can predict the magnetic excitation spectrum quantitatively. Our results show that this model can be renormalized to a simple Kondo lattice model decorated with short-range super exchange as well as long-range particle-particle interactions to account for the formation of magnetic order. This microscopically-derived modified Kondo lattice model quantitatively reproduces the low-energy magnetic soft modes in CeIn3, which are key to understanding unconventional superconductivity.

Primary author


Daniel Mazzone (Paul Scherrer Institut) Jakob Lass (Paul Scherrer Institut) Christof Niedermayer (Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute) Marc Janoschek (Paul Scherrer Institut) Zhentao Wang (University of Tennessee Knoxville) Esteban Ghioldi (University of Tennessee Knoxville) David Fobes (Los Alamos National Laboratory) Andrey Podlesnyak (Oak Ridge National Laboratory) Nakheon Sung (Los Alamos National Laboratory) Eric Bauer (Los Alamos National Laboratory) Yusuke Nomura (RIKEN) Ryotaro Arita (RIKEN) Filip Ronning (Los Alamos National Laboratory) Christian Batista (University of Tennessee Knoxville) Jakub Vonka (Paul Scherrer Institute)

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