Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder compound
- 14 September 2021
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 104 (10), L100409
- https://doi.org/10.1103/physrevb.104.l100409
Abstract
Inelastic-neutron-scattering measurements were performed on a single crystal of the heavy-fermion paramagnet above its superconducting temperature. We confirm the presence of antiferromagnetic fluctuations with the incommensurate wave-vector . A quasielastic signal is found, whose momentum-transfer dependence is compatible with fluctuations of magnetic moments with a sine-wave modulation of wave-vector and in-phase moments on the nearest U atoms. Low dimensionality of the magnetic fluctuations, consequence of the ladder structure, is indicated by weak correlations along the direction . These fluctuations saturate below the temperature , in possible relation with anomalies observed in thermodynamic, electrical-transport, and nuclear-magnetic-resonance measurements. The absence or weakness of ferromagnetic fluctuations in our data collected at temperatures down to 2.1 K and energy transfers from 0.6 to 7.5 meV is emphasized. These results constitute constraints for models of magnetically mediated superconductivity in .
Keywords
Funding Information
- Agence Nationale de la Recherche
- Japan Society for the Promotion of Science (JP19H00646, 19K03756, JP20H00130, 20H01864, JP20K20889, JP20KK0061, 21H04987)
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