Memory effect and magnetic relaxation in Ca3Co2O6 and the doped compounds

We report memory effect and magnetic relaxation in spin-chain compounds Ca3Co2O6, Ca3Co2−xTxO6 (T=Mn, Fe, Al, and Mg) with x=0.02 and 0.04, and Ca3−xAxCo2O6 (A=Sr and Na) with x=0.06 and 0.12. The memory effect serves as an evidence of spin-glass-like freezing at low temperatures. The time-dependent...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2014-01, Vol.433, p.21-27
Main Authors: Shi, X.M., Ouyang, Z.W., Ruan, M.Y., Guo, Y.M., Cheng, J.J., Xia, Z.C.
Format: Article
Language:English
Subjects:
Aluminum
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Domain effects, magnetization curves, and hysteresis
Doping
Exact sciences and technology
Frustration
Iron
Magnetic properties and materials
Magnetic relaxation
Magnetization
Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects
Memory effect
Physics
Spin-chain compound
Uncertainty
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Summary:We report memory effect and magnetic relaxation in spin-chain compounds Ca3Co2O6, Ca3Co2−xTxO6 (T=Mn, Fe, Al, and Mg) with x=0.02 and 0.04, and Ca3−xAxCo2O6 (A=Sr and Na) with x=0.06 and 0.12. The memory effect serves as an evidence of spin-glass-like freezing at low temperatures. The time-dependent magnetization exhibits a nearly exponential variation with time for initial relaxation and is not much influenced by chemical doping. With time goes on, the magnetization follows the stretched exponential function and doping effect gradually appears with uncertainty. In comparison, the influence from Fe-doping is dramatic and possible reason is proposed within the geometrical frustration scenario.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2013.10.015