Spin-singlet formation in the geometrically frustrated spinel oxide AlV2O4: 51V and 27A l NMR measurements

Yasuhiro Shimizu, Moe Tanaka, Masayuki Itoh, Takuro Katsufuji

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16 Citations (Scopus)

Abstract

We report V 51 and A 27 l NMR studies of the spin-frustrated spinel oxide AlV2 O4 in a temperature range from 850 to 2 K across a structural phase transition at 700 K. Knight shifts and nuclear spin-lattice relaxation rates at the V and Al sites show that the local spin susceptibility at two V sites diminishes at low temperatures in the insulating state, giving direct evidence for the spin-singlet formation. In addition to the singlet spins, one of the two Al sites probes paramagnetic spins with the Curie-Weiss behavior and the spin-glass transition. The results demonstrate coexistence of the spin-singlet cluster and the nearly free spins, anticipated from a theoretical model and the bulk magnetic-susceptibility measurements.

Original languageEnglish
Article number144423
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number14
DOIs
Publication statusPublished - 2008 Oct 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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