Amorphous concentrated spin-glasses:MnX(X=Ge,C,Si−Te)
| Autor: | J. J. Hauser |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
Condensed Matter::Materials Science
Materials science Spin glass Ferromagnetism Condensed matter physics Ferrimagnetism Metastability Antiferromagnetism Order (ring theory) Condensed Matter::Strongly Correlated Electrons Condensed Matter::Disordered Systems and Neural Networks Amorphous solid Superparamagnetism |
| Zdroj: | Physical Review B. 22:2554-2559 |
| ISSN: | 0163-1829 |
| DOI: | 10.1103/physrevb.22.2554 |
| Popis: | Amorphous MnSi is a concentrated spin-glass. In order to understand the underlying reason, the following similar systems were investigated: ${\mathrm{Mn}}_{3}$${\mathrm{Ge}}_{2}$, MnGe, MnC, MnAs, and MnSb. In the case of MnAs and MnSb which are strong ferromagnets in the crystalline state, the amorphous films were ferromagnetic or superparamagnetic and no spin-glass transition could be detected. On the other hand, crystalline ${\mathrm{Mn}}_{3}$${\mathrm{Ge}}_{2}$ is antiferromagnetic below 150 K and amorphous MnGe ($a$-MnGe) and $a$-${\mathrm{Mn}}_{3}$${\mathrm{Ge}}_{2}$ show spin-glass transitions at, respectively, 48 and 53 K. MnC does not exist as a stable crystalline compound. However, $a$-MnC films were obtained by sputtering at 77 K and such films show a definite spin-glass transition at 21 K. Metastable microcrystalline MnC films obtained by deposition at 400 K indicate that crystalline MnC is weakly magnetic below ${T}_{C}=300$ K. This suggests that weak ferro- or ferrimagnetism or antiferromagnetism is required in the crystalline state in order to observe a spin-glass transition in the amorphous state. While $\mathrm{Mn}X(X=\mathrm{S}\mathrm{i},\phantom{\rule{0ex}{0ex}}\mathrm{G}\mathrm{e},\phantom{\rule{0ex}{0ex}}\mathrm{C})$ spin-glasses are metallic, a spin-glass transition has also been observed in semiconducting MnSi-MnTe mixtures. |
| Databáze: | OpenAIRE |
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