Slow Spin-Dynamics in kagom?-bilayer Frustrated Magnets - evidence for phonon assisted relaxation in SrCr9xGa12−9xO19
Journal Article
·
· Physical Review Letters
OSTI ID:1003588
- ORNL
A neutron spin-echo investigation of the low temperature spin dynamics in two well-characterized kagome bilayer compounds SrCr{sub 9x}Ga{sub 12-9x}O{sub 19} (x = 0.95, SCGO) and Ba{sub 2}Sn{sub 2}ZnCr{sub 7x}Ga{sub 10-7x}O{sub 22} (x = 0.97, BSZCGO) reveals two novel features. One is the slowing down of the relaxation rate without critical behavior at T{sub g}, where a macroscopic spin-glass-like freezing occurs. The second is, in SCGO at 4 K ({approx} T{sub g}) < T < 7 K, the relaxation rate activation energy E{sub a} = 7 {+-} 0.4 meV, equal to the energy of a phonon mode, pointing out the role of spin-lattice coupling.
- 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:
- 1003588
- Journal Information:
- Physical Review Letters, Vol. 97, Issue 4; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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