Ferromagnetic quantum critical point induced by tuning the magnetic dimensionality of the heavy-fermion iron oxypnictide Ce(Ru1-xFe x)PO

Shunsaku Kitagawa, Kenji Ishida, Tetsuro Nakamura, Masanori Matoba, Yoichi Kamihara

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We have performed 31P-NMR measurements of the c-axis-aligned poly-crystal Ce(Ru1-xFex)PO with a twodimensional layered structure in order to understand the origin of TCurie suppression by Fe substitution. The variation in the magnetic-fluctuation character with respect to x is investigated from the in-plane and out-of-plane fluctuations and the relationship between the static spin susceptibility and the in-plane fluctuation. It was found that three-dimensional ferromagnetic (FM) correlations are dominant and give rise to the FM ordering in CeRuPO. The out-of plane fluctuations are significantly suppressed with increasing x, and it was revealed that the FM fluctuations become two dimensional near a FM quantum critical point (QCP). Our NMR results strongly suggest that a unique FM QCP in Ce(Ru 1-xFex)PO is induced by the suppression of the magnetic correlations along the c-axis, which is a different mechanism from that presumed in heavy-fermion compounds.

Original languageEnglish
Article number033704
JournalJournal of the Physical Society of Japan
Volume82
Issue number3
DOIs
Publication statusPublished - 2013 Mar 1

Keywords

  • Dimensional tuning
  • Ferromagnetism
  • Heavy fermion
  • NMR
  • Quantum criticality

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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