Evidence for Coexistence of Bulk Superconductivity and Itinerant Antiferromagnetism in the Heavy Fermion System CeCo(In\(_{1-x}\)Cd\(_x\))\(_5\)

• Published in: arXiv.org
• Main Authors: Howald, Ludovic, Stilp, Evelyn, Pierre Dalmas de Réotier, Yaouanc, Alain, Raymond, Stéphane, Piamonteze, Cinthia, Lapertot, Gérard, Baines, Christopher, Keller, Hugo
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 02.09.2015
• Subjects: Antiferromagnetism; Carrier density; Electronic structure; External pressure; Fermions; Heavy fermion systems; Magnetism; Muon spin rotation; Neutron scattering; Organic chemistry; Parameter modification; Phase diagrams; Phase transitions; Superconductivity; Transition temperature; Tuning; X ray absorption
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1509.00633

In the generic phase diagram of heavy fermion systems, tuning an external parameter such as hydrostatic or chemical pressure modifies the superconducting transition temperature. The superconducting phase forms a dome in the temperature-tuning parameter phase diagram, which is associated with a maximum of the superconducting pairing interaction. Proximity to antiferromagnetism suggests a relation between the disappearance of antiferromagnetic order and superconductivity. We combine muon spin rotation, neutron scattering, and x-ray absorption spectroscopy techniques to gain access to the magnetic and electronic structure of CeCo(In\(_{1-x}\)Cd\(_x\))\(_5\) at different time scales. Different magnetic structures are obtained that indicate a magnetic order of itinerant character, coexisting with bulk superconductivity. The suppression of the antiferromagnetic order appears to be driven by a modification of the bandwidth/carrier concentration, implying that the electronic structure and consequently the interplay of superconductivity and magnetism is strongly affected by hydrostatic and chemical pressure.