O'Neill, CD;
Schmehr, JL;
Keen, HDJ;
Pritchard Cairns, L;
Sokolov, DA;
Hermann, A;
Wermeille, D;
... Huxley, AD; + view all
(2021)
Non-Fermi liquid behavior below the Néel temperature in the frustrated heavy fermion magnet UAu₂.
Proceedings of the National Academy of Sciences of the United States of America
, 118
(49)
, Article e2102687118. 10.1073/pnas.2102687118.
Preview |
Text
UAu2.pdf - Accepted Version Download (7MB) | Preview |
Abstract
The term Fermi liquid is almost synonymous with the metallic state. The association is known to break down at quantum critical points (QCPs), but these require precise values of tuning parameters, such as pressure and applied magnetic field, to exactly suppress a continuous phase transition temperature to the absolute zero. Three-dimensional non-Fermi liquid states, apart from superconductivity, that are unshackled from a QCP are much rarer and are not currently well understood. Here, we report that the triangular lattice system uranium diauride (UAu2) forms such a state with a non-Fermi liquid low-temperature heat capacity [Formula: see text] and electrical resistivity [Formula: see text] far below its Néel temperature. The magnetic order itself has a novel structure and is accompanied by weak charge modulation that is not simply due to magnetostriction. The charge modulation continues to grow in amplitude with decreasing temperature, suggesting that charge degrees of freedom play an important role in the non-Fermi liquid behavior. In contrast with QCPs, the heat capacity and resistivity we find are unusually resilient in magnetic field. Our results suggest that a combination of magnetic frustration and Kondo physics may result in the emergence of this novel state.
| Type: | Article |
|---|---|
| Title: | Non-Fermi liquid behavior below the Néel temperature in the frustrated heavy fermion magnet UAu₂ |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1073/pnas.2102687118 |
| Publisher version: | https://doi.org/10.1073/pnas.2102687118 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Kondo physics, charge density wave, magnetic frustration, non-Fermi liquid, quantum criticality |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10140716 |
Archive Staff Only
 |
View Item |
