Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
70 (1991), S. 6184-6186
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Polycrystalline samples of the tubular phase Bi4Sr8Cu5O19+x with Fe ions substituting the Cu positions have been prepared up to a maximum content of 2 Fe ions per unit formula. The electrical and magnetic properties of these oxides have been examined and it is shown that they are insulating and present a complex magnetic behavior. It is found that the Fe ions have a localized magnetic moment displaying a Curie–Weiss law at high temperatures while below T≈100 K antiferromagnetic correlations are detected. From the evaluation of the effective paramagnetic moment and its composition dependence it is deduced that Fe doping induces a paramagnetic moment in some Cu ions which then contribute also to the temperature dependent paramagnetism. Finally, at lower temperatures (T〈25 K) a susceptibility peak is observed signaling a freezing of the magnetic moments. We suggest a spin-glass behavior associated either to a clustering of Fe ions or to the development of correlated domains interacting through the strongly correlated copper ions. We point out that the weak sensitivity of the resistivity on the Fe concentration gives further support to the hypothesis of some Fe clustering within the tubular crystal structure.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.350012
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