Stripe antiferromagnetism and disorder in the Mott insulator NaFe1-xCuxAs (xâ‰0.5)

Yizhou Xin, Ingrid Stolt, Yu Song, Pengcheng Dai, W. P. Halperin

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Neutron scattering measurements have demonstrated that the heavily Cu doped NaFe1-xCuxAs compound behaves like a Mott insulator exhibiting both real-space Fe-Cu stripes and antiferromagnetism below a Neél temperature for xâ‰0.5. We have investigated the evolution of structural and magnetic ordering using Na23 and As75 NMR for single crystals (x = 0.39 and 0.48), confirming antiferromagnetism in the form of magnetic stripes. We show that end-chain defects in these stripes are the principal source of magnetic disorder and are responsible for cluster spin-glass transitions in both compounds, in the latter case coexistent with antiferromagnetism. Aided by our numerical simulation of the As75 spectra, we show that a staggered magnetization at the Fe sites is induced by nonmagnetic Cu dopants.

Original languageEnglish (US)
Article number064410
JournalPhysical Review B
Volume101
Issue number6
DOIs
StatePublished - Feb 1 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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