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Article
17O and 51V NMR for the zigzag spin-1 chain compound CaV2O4
Physical Review B
  • X. Zong, Iowa State University
  • B. J. Suh, Iowa State University
  • A. Niazi, Iowa State University
  • J.-Q. Yan, Iowa State University
  • Deborah L. Schlagel, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • David C. Johnston, Iowa State University
Document Type
Article
Publication Date
1-10-2008
DOI
10.1103/PhysRevB.77.014412
Abstract

51V NMR studies on CaV2O4 single crystals and 17O NMR studies on 17O-enriched powder samples are reported. The temperature dependences of the 17O NMR linewidth and nuclear spin-lattice relaxation rate give strong evidence for a long-range antiferromagnetic transition at TN=78 K in the powder. Magnetic susceptibility measurements show that TN=69 K in the crystals. A zero-field 51V NMR signal was observed at low temperatures (f≈237 MHz at 4.2 K) in the crystals. The field-swept spectra with the field in different directions suggest the presence of two antiferromagnetic substructures. Each substructure is collinear, with the easy axes of the two substructures separated by an angle of 19(1)°, and with their average direction pointing approximately along the b axis of the crystal structure. The two spin substructures contain equal numbers of spins. The temperature dependence of the ordered moment, measured up to 45 K, shows the presence of an energy gap EG in the antiferromagnetic spin wave excitation spectrum. Antiferromagnetic spin wave theory suggests that EG∕kB lies between 64 and 98 K.

Comments

This article is from Physical Review B 77 (2008): 014412, doi:10.1103/PhysRevB.77.014412.

Copyright Owner
American Physical Society
Language
en
Date Available
2013-09-23
File Format
application/pdf
Citation Information
X. Zong, B. J. Suh, A. Niazi, J.-Q. Yan, et al.. "17O and 51V NMR for the zigzag spin-1 chain compound CaV2O4" Physical Review B Vol. 77 Iss. 1 (2008) p. 014412
Available at: http://works.bepress.com/thomas_lograsso/80/