Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Pair correlations, short-range order, and dispersive excitations in the quasi-kagome quantum magnet volborthite
 
Loading...
Thumbnail Image
research article

Pair correlations, short-range order, and dispersive excitations in the quasi-kagome quantum magnet volborthite

Nilsen, G. J.
•
Coomer, F. C.
•
de Vries, M. A.
Show more
2011
Physical Review B

We present spatial and dynamic information on the s = 1/2 distorted kagome antiferromagnet volborthite, Cu3V2O7(OD)(2) center dot 2D(2)O, obtained by polarized and inelastic neutron scattering. The instantaneous structure factor, S(Q), is dominated by nearest-neighbor pair correlations, with short-range order at wave vectors Q(1) = 0.65(3) angstrom(-1) and Q(2) = 1.15(5) angstrom(-1) emerging below 5 K. The excitation spectrum, S(Q,omega), reveals two steep branches dispersing from Q(1) and Q(2), and a flat mode omega(f) = 5.0(2) meV. The results allow us to identify the crossover at T* similar to 1 K in V-51 NMR and specific-heat measurements as the buildup of correlations at Q(1). We compare our data to theoretical models proposed for volborthite, and also demonstrate that the excitation spectrum can be explained by spin-wave-like excitations with anisotropic exchange parameters, as suggested by recent local-density calculations.

  • Files
  • Details
  • Metrics
Type
research article
DOI
10.1103/PhysRevB.84.172401
Web of Science ID

WOS:000296860400001

Author(s)
Nilsen, G. J.
•
Coomer, F. C.
•
de Vries, M. A.
•
Stewart, J. R.
•
Deen, P. P.
•
Harrison, A.
•
Ronnow, H. M.  
Date Issued

2011

Published in
Physical Review B
Volume

84

Article Number

172401

Subjects

Antiferromagnet

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LQM  
Available on Infoscience
December 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/73302
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés