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Phys. Rev. Lett. 96, 177201 (2006) [4 pages]

Field-Induced Order and Spin Waves in the Pyrochlore Antiferromagnet Tb2Ti2O7

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K. C. Rule1, J. P. C. Ruff1, B. D. Gaulin1,2, S. R. Dunsiger1, J. S. Gardner3,4, J. P. Clancy1, M. J. Lewis1, H. A. Dabkowska1, I. Mirebeau5, P. Manuel6, Y. Qiu4,7, and J. R. D. Copley4
1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
2Canadian Institute for Advanced Research, 180 Dundas Street West, Toronto, Ontario, M5G 1Z8, Canada
3Brookhaven National Laboratory, Upton, New York 11973-5000, USA
4National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899-8562, USA
5Laboratoire Leon Brillouin, CEA-CNRS, CE-Saclay, 91191 Gif-sur-Yvette, France
6ISIS Facility, Rutherford Appleton Laboratory, Didcot, Oxon, OX11 0QX, United Kingdom
7Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

Received 30 January 2006; published 1 May 2006

High resolution time-of-flight neutron scattering measurements on Tb2Ti2O7 reveal a rich low temperature phase diagram in the presence of a magnetic field applied along [110]. In zero field at T=0.4  K, Tb2Ti2O7 is a highly correlated cooperative paramagnet with disordered spins residing on a pyrochlore lattice of corner-sharing tetrahedra. Application of a small field condenses much of the magnetic diffuse scattering, characteristic of the disordered spins, into a new Bragg peak characteristic of a polarized paramagnet. At higher fields, a magnetically ordered phase is induced, which supports spin wave excitations indicative of continuous, rather than Ising-like, spin degrees of freedom.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.177201
DOI:
10.1103/PhysRevLett.96.177201
PACS:
75.25.+z, 75.40.Gb
 
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