SrFe0.9Ti0.1O3−δ: A cluster spin glass

• Prepared SrFe0.9Ti0.1O3−δ is in nanocrystalline form.
• Arrott plot shows absence of spontaneous magnetization which rules out the possibility of long range ferromagnetic order.
• AC susceptibility data is evidence of cluster spin glass.
• There is no magnetic Bragg's reflection.
• By substituting Ti4+, helical antiferromagetic SrFeO3 is transformed to a cluster spin glass.

The magnetic ground state of nanocrystalline SrFe0.9Ti0.1O3−δ system has been investigated from 2 K to 300 K using AC Susceptibilty (ACS), magnetization and neutron diffraction measurements. The cusp in the temperature dependent magnetization and dispersion below Tmax (the temperature at which the maximum susceptibility is observed) in real part of ac susceptibility with frequency is observed. Arrott plot shows the lack of MS (spontaneous magnetization) down to 2 K, and the non-occurrence of magnetic Bragg reflections below the Tmax in neutron diffraction measurements, indicates the absence of long range ferro and antiferromagnetic order. The frequency dependence of Tmax obeys Vögel–Fulcher model establishing the cluster spin glass behavior in this system.

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