Ordering in the dilute weakly anisotropic antiferromagnet Mn{sub 0.35}Zn{sub 0.65}F{sub 2}
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Departamento de Fisica, Universidade Federal de Pernambuco, 50670-901 Recife PE, (Brazil)
- Department of Physics, University of California, Santa Cruz, California 95064 (United States)
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
The highly diluted antiferromagnet Mn{sub 0.35}Zn{sub 0.65}F{sub 2} has been investigated by neutron scattering in zero field. The Bragg peaks observed below the Neel temperature (T{sub N}{approx_equal}10.9 K) indicate stable antiferromagnetic (AF) long-range ordering at low temperature. The critical behavior is compatible with random-exchange Ising model critical exponents ({nu}{approx_equal}0.69 and {gamma}{approx_equal}1.31), as reported for Mn{sub x}Zn{sub 1-x}F{sub 2} with higher x and for the isostructural compound Fe{sub x}Zn{sub 1-x}F{sub 2}. However, in addition to the Bragg peaks, unusual scattering behavior appears around the (1 0 0) AF Bragg peak below a glassy temperature T{sub g}{approx_equal}7.0 K. The glassy region T<T{sub g} corresponds to that of noticeable frequency dependence in earlier zero-field ac susceptibility measurements on this sample. These results indicate that long-range order coexists with short-range nonequilibrium clusters in this highly diluted magnet. (c) 2000 The American Physical Society.
- OSTI ID:
- 20216577
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 21 Vol. 61; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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