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Updated: Feb 15, 2026

Glass-Based Devices to Generate Drops and Emulsions
Published on: April 5, 2022
Instability of spin glass phase in divalent iron phosphate glass under a magnetic field
Yuko Nakatsuka1, Shunsuke Murai1, Koji Fujita1
1Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Abstract:
The spin glass behaviour of 50FeO · 50P2O5 (in mol%) glass has been examined under finite magnetic fields. The Sherrington-Kirkpatrick (SK) model, i.e. the mean field theory, is unsuitable for the interpretation of the frequency dependence of the ac magnetic susceptibility observed under an external field of 0.1 T; the critical exponent derived from the SK model is unphysically large. On the other hand, the droplet model explains well the frequency and field dependence of the spin-freezing temperature and the exponent of the thermally activated process is within the range defined by the droplet model. The results indicate that the spin glass phase of the 50FeO · 50P2O5 glass is unstable against magnetic fields.
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