Non-monotonic pressure dependence of high-field nematicity and magnetism in CeRhIn<sub>5</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 32661299.
- Also identified by DOI 10.1038/s41467-020-17274-6 and PMC identifier 7359027.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
CeRhIn<sub>5</sub> provides a textbook example of quantum criticality in a heavy fermion system: Pressure suppresses local-moment antiferromagnetic (AFM) order and induces superconductivity in a dome around the associated quantum critical point (QCP) near p<sub>c</sub> ≈ 23 kbar. Strong magnetic fields also suppress the AFM order at a field-induced QCP at B<sub>c</sub> ≈ 50 T. In its vicinity, a nematic phase at B<sup>*</sup> ≈ 28 T characterized by a large in-plane resistivity anisotropy emerges. Here, we directly investigate the interrelation between these phenomena via magnetoresistivity measurements under high pressure. As pressure increases, the nematic transition shifts to higher fields, until it vanishes just below p<sub>c</sub>. While pressure suppresses magnetic order in zero field as p<sub>c</sub> is approached, we find magnetism to strengthen under strong magnetic fields due to suppression of the Kondo effect. We reveal a strongly non-mean-field-like phase diagram, much richer than the common local-moment description of CeRhIn<sub>5</sub> would suggest.