Spin diffusion in the S = 1/2 quasi one-dimensional antiferromagnet α-VO(PO3)2 via 31P NMR

Jun Kikuchi, Naohiko Kurata, Kiyoichiro Motoya, Touru Yamauchi, Yutaka Ueda

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Low-frequency spin dynamics in the S = 1/2 antiferromagnetic spin-chain compound α-VO(PO3)2 has been studied by means of 31P NMR. The nuclear spin-lattice relaxation rate 1/T1 at the P site exhibits H-1/2 dependence on the applied magnetic field (H) at temperatures (T) well above the intrachain coupling strength J/kB = 3.50 K indicating one-dimensional diffusive spin dynamics. The diffusive contribution to 1/T1 decreases on cooling as electronic spins acquire shortrange antiferromagnetic correlations within the chain, and vanishes almost entirely around T ≈ J/kB. This is accompanied by an apparent increase of the spin-diffusion constant from the value expected in the classical limit. On the other hand, the field-independent part of 1/T1 increases with decreasing temperature, which may be a precursor for the true long-range antiferromagnetic ordering found below TN = 1.93 ± 0.01 K.

Original languageEnglish
Pages (from-to)2765-2773
Number of pages9
JournalJournal of the Physical Society of Japan
Volume70
Issue number9
DOIs
Publication statusPublished - 1 Sep 2001

Keywords

  • α-VO(PO)
  • Antiferromagnetic spin chain
  • NMR
  • Nuclear spin relaxation
  • Spin diffusion

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