Spin-glass insulator

Fig. 28. Tentative phase diagram for LaMnC)3+5, 0 < <5 < 0.18. Data from Topfer and Goodenough (1997b). PI = paramagnetic insulator, CAFI = canted-spin antiferromagnetic (A-type) insulator, SGI = spin-glass insulator, FI = ferromagnetic insulator, MCS = metamagnetic canted-spin configuration.

Haushalter RC, O Connor CM, Haushalter JP et al (1984) Synthesis of new amorphous metallic spin-glasses Ct2SnTe4, Mu2SnTe4, Ee2SnTe4, Co2SnTe4 - solvent induced metal-insulator transformations. Angew Chem hit Ed 23(2) 169-170... 

Electron-spin resonance (ESR) is an extremely useful tool for probing the localized magnetic moment in a variety of materials. The chapter (162) by Elschner and Loidl focuses on metallic lanthanide systems, reviewing both the classical ESR behaviors and the role of ESR in newly developed branches of solid-state physics. The former includes the determination of the site symmetry of the ESR probe and measurement of the crystal field (CF) and how it (CF) differs in metallic systems from that in insulators. The latter deals with Van Vleck systems, spin glasses, Kondo systems, heavy-fermion and intermediate-valence compounds, and high-temperature superconductors. 

This anisotropy is of order 1 K only and probably not important for typical metallic spin glasses. It may be relevant for insulating spin glasses Eu, Srj, S (Binder and Kinzel 1983). 

These properties of C (T) are observed in metallic (e.g. CuMn Wenger and Keesom 1976) as well as in insulating spin glasses (Eu Sr, S Meschede et al. 

Similar time dependencies are observed in low-frequency magnetic noise measurements of the insulating spin glass CsNiFeFg at 4.2 K (Tj = 5.4 K) by Ocio et al. 

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