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Co-existence of ferrimagnetism and spin-glass state in the spinel Co2SnO4
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) X-ray diffraction patterns of the CoSnO in the form of polycrystalline powder and bulk pellet with Miller indices of the peaks marked. The two weak reflections due to SnO minor phase are indicated with an asterisk (∗). (b) Scanning electron micrograph of pellet showing particles with sizes 3–5m.

Image of FIG. 2.
FIG. 2.

Temperature dependence of the magnetization M(T) in the range 2–60 K under ZFC and FC conditions with H = 200 Oe,1 kOe, and 2 kOe). The right hand side scale shows the difference in the magnetization ΔM under FC and ZFC conditions.

Image of FIG. 3.
FIG. 3.

Plots of d(χT)/dT versus T plots at various external fields H = 200 Oe, 1 kOe, and 2 kOe. The insets depict the d(χT)/dT plotted with a logarithmic scale to show the variation in the peak clearly.

Image of FIG. 4.
FIG. 4.

Plots of χ versus T and χ versus T for temperatures up to 350 K are shown. The solid lines are fits to the Néel's expression for ferrimagnets discussed in the text.

Image of FIG. 5.
FIG. 5.

Hysteresis loops (M versus H) recorded at T = 30, 40, and 50 K from H = −50 kOe to +50 kOe.

Image of FIG. 6.
FIG. 6.

Temperature dependence of ac magnetic susceptibilities: (a) real part χ′(T), and (b) imaginary χ″(T) component of bulk CoSnO recorded at various bias fields H = 20, 50, 100, and 150 Oe with constant frequency of 2 Hz and amplitude of 1 Oe under zero field condition. The insets (a)–(c) depict the same curves at various temperature regimes to show the transitions better.

Image of FIG. 7.
FIG. 7.

Temperature variation of d(χ′T)/dT plots at different bias fields H = 20, 50, 100, and 150 Oe. Notice the shift in the peak positions with increase in the bias field similar to the variation in χ″( .

Image of FIG. 8.
FIG. 8.

Variation of ferrimagnetic Néel temperature T and spin-glass transition temperature T with respect to H . The solid lines show the linear fit to the data (often called the de Almeida-Thouless AT line) whereas the dotted line for T is for visual aid.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Co-existence of ferrimagnetism and spin-glass state in the spinel Co2SnO4