Frustrated spin correlations in diluted spin ice Ho(2-x)La(x)Ti2O7
- ORNL
We have studied the evolution of the structural properties as well as the static and dynamic spin correlations of spin ice Ho{sub 2}Ti{sub 2}O{sub 7}, where Ho was partially replaced by non-magnetic La. The crystal structure of diluted samples Ho{sub 2-x}La{sub x}Ti{sub 2}O{sub 7} was characterized by x-ray and neutron diffraction and by Ho LIII-edge and Ti K-edge extended x-ray absorption fine structure (EXAFS) measurements. It is found that the pyrochlore structure remains intact until about x = 0.3, but a systematic increase in local disorder with increasing La concentration is observed in the EXAFS data, especially from the Ti K edge. Quasi-elastic neutron scattering and ac susceptibility measurements show that, in x{le}0.4 samples at temperatures above macroscopic freezing, the spin-spin correlations are short ranged and dynamic in nature. The main difference with pure spin ice in the dynamics is the appearance of a second, faster, relaxation process.
- 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:
- 931175
- Journal Information:
- Journal of Physics: Condensed Matter, Vol. 20, Issue 23; ISSN 0953-8984
- Country of Publication:
- United States
- Language:
- English
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