Collective Dynamics in the Heisenberg Pyrochlore Antiferromagnet Gd2Sn2O7
- ORNL
Gd{sub 2}Sn{sub 2}O{sub 7} is believed to be a good approximation to a Heisenberg antiferromagnet on a pyrochlore lattice with exchange and dipole-dipole interactions. The system is known to enter a long-range ordered ground state (the 'Palmer Chalker' state) below T{sub c} = 1 K with k{sub ord} = (000). However, persistent electronic spin fluctuations have been observed as T {yields} 0. Using inelastic neutron scattering, we have studied the buildup of short-range spin-spin correlations as the temperature is lowered, and the eventual formation of a gapped long-range ordered state that is able to sustain spin waves below T{sub c}. As a magnetic field is applied, new magnetic phases develop and the gap widens. These measurements show that Gd{sub 2}Sn{sub 2}O{sub 7} completely relieves itself of frustration, but the self-selected ground state is very delicate.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 944843
- Journal Information:
- Physical Review B, Vol. 78, Issue 13
- Country of Publication:
- United States
- Language:
- English
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