No evidence for "small-moment antiferromagnetism" under ambient pressure in URu2Si2: Single-crystal 29Si NMR study

Shigeru Takagi, Shu Ishihara, Satoru Saitoh, Hiko Ichiro Sasaki, Hiroshi Tanida, Makoto Yokoyama, Hiroshi Amitsuka

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44 Citations (Scopus)


The still unidentified hidden order (HO) phase below T0 = 17.5 K in the heavy-electron superconductor URu2Si2 has been investigated by 29Si NMR on a single crystal under external magnetic field Hext ∥ c-axis and ambient pressure P. For a previously proposed model of the small-moment antiferromagnetism (SMAF), in which tiny-moment antiferromagnetism (AF) under ambient P is ascribed to spatially homogeneous AF with an ordered moment μSMAF = 0.02 -0.04 μB, splitting of the line would be expected on the basis of a scaling from the corresponding splitting in the P-induced AF. However, we observed at T = 4.5 K no splitting of the line. This clearly indicates that the SMAF model cannot describe the ambient-P properties. Below T0 down to ∼14 K, the 29Si NMR line shows additional broadening over the paramagnetic width. The additional contribution, however, disappears below ∼14 K, which indicates that the HO itself produces almost zero internal field at the 29Si site along the c-axis at low temperatures in the HO phase.

Original languageEnglish
Article number033708
Journaljournal of the physical society of japan
Issue number3
Publication statusPublished - 2007 Mar
Externally publishedYes


  • Antiferromagnetism
  • Heavy electron
  • NMR
  • U compounds
  • URuSi

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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