Ferromagnetic quantum critical point in heavy-fermion iron oxypnictide Ce(Ru1-xFex)PO

S. Kitagawa, K. Ishida, T. Nakamura, M. Matoba, Y. Kamihara

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Abstract

We have performed P31-NMR measurements on Ce(Ru1-xFe x)PO in order to investigate ferromagnetic (FM) quantum criticality, since a heavy-fermion (HF) ferromagnet CeRuPO with a two-dimensional structure turns into a HF paramagnet by an isovalent Fe substitution for Ru. We found that Ce(Ru0.15Fe0.85)PO shows critical fluctuations down to ∼0.3K, as well as the continuous suppression of Curie temperature and the ordered moments by the Fe substitution. These experimental results suggest the presence of a FM quantum critical point (QCP) at x∼0.86, which is a rare example among itinerant ferromagnets. In addition, we point out that the critical behaviors in Ce(Ru0.15Fe0.85)PO share a similarity with those in YbRh2Si2, where the local criticality of f electrons has been discussed. We reveal that Ce(Ru 1-xFex)PO is a new system to study FM quantum criticality in HF compounds.

Original languageEnglish
Article number227004
JournalPhysical review letters
Volume109
Issue number22
DOIs
Publication statusPublished - 2012 Nov 27

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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