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Correlated electron state in CeCu2Si2 controlled through Si to P substitution

TitleCorrelated electron state in CeCu2Si2 controlled through Si to P substitution
Publication TypeJournal Article
Year of Publication2017
AuthorsLai, Y, Saunders, SM, Graf, D, Gallagher, A, Chen, KW, Kametani, F, Besara, T, Siegrist, T, Shekhter, A, Baumbach, RE
JournalPhysical Review Materials
Date Published08
Type of ArticleArticle
ISBN Number2475-9953
Accession NumberWOS:000416566100001
Keywordsantiferromagnetism, behavior, cecu2(si1-xgex)(2), cepd2si2, heavy, hybridization, magnetic-properties, metals, superconducting phases, valence

P chemical substitution, which compresses the unit cell volume but simultaneously weakens the hybridization between the f - and conduction electron states and encourages complex magnetism. At concentrations that show magnetism, applied pressure suppresses the magnetic ordering temperature and superconductivity is recovered for samples with low disorder. These results reveal that the electronic behavior in this system is controlled by a nontrivial combination of effects from unit cell volume and electronic shell filling. Guided by this topography, we discuss prospects for uncovering a valence fluctuation quantum phase transition in the broader family of Ce-based ThCr2Si2-type materials through chemical substitution.

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