Critical spin dynamics in the antiferromagnet La4Ni 3O8 from La139 nuclear magnetic resonance

Nicholas Aproberts-Warren, Adam P. Dioguardi, Viktor V. Poltavets, Martha Greenblatt, Peter Klavins, Nicholas J. Curro

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Abstract

We report La139 nuclear magnetic resonance data in La4Ni 3O8 that reveal the presence of antiferromagnetic order below TN∼105 K. This remarkable compound contains two-dimensional (2D) layers of NiO2 with unusual Ni valences. La4Ni 3O8, with antiferromagnetic order of S=1/2Ni1+ spins, is analogous to the parent compounds of the cuprate superconductors. Our data clearly reveal dramatic spectral changes and low-energy antiferromagnetic correlations associated with the onset of long-range order below TN. These critical spin fluctuations, however, do not diverge at the second-order phase transition but rather appear to be associated with a T=0 transition characteristic of 2D spin fluctuations.

Original languageEnglish (US)
Article number014402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number1
DOIs
StatePublished - Jan 10 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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