Journal
PHYSICAL REVIEW B
Volume 80, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.024419
Keywords
ageing; lutetium compounds; magnetic susceptibility; magnetic transitions; magnetisation; specific heat; spin glasses
Funding
- Natural Sciences and Engineering Research Council of Canada
- Canadian Foundation for Innovation
- Ontario Innovation Trust
- Ontario Ministry of Research and Innovation
- U.S. Department of Energy, Office of Science
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We have carried out a comprehensive investigation of magnetic properties of LuFe2O4+delta, measuring ac susceptibility, dc magnetization, and specific heat. A magnetic phase transition around 236 K is identified as a paramagnetic to ferrimagnetic transition in accordance with previous studies. Upon further cooling below this temperature, highly relaxational magnetic behavior is observed: the dc magnetization exhibits history and time dependence, and the real and the imaginary parts of the ac susceptibility show large frequency dependence. Dynamic scaling of the ac susceptibility data suggests that this low-temperature phase can be described as a spin-glass phase. We also discuss the magnetic field dependence of the spin-glass transition and aging, memory, and rejuvenation effect below the glass transition temperature around 229 K.
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