Low-Temperature Magnetization Studies of Nb x Si 1− x Films
| Autor: | L. C. Allen, Ravindra N. Bhatt, M. A. Paalanen |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
chemistry.chemical_classification
Materials science Condensed matter physics General Physics and Astronomy Magnetic susceptibility Magnetic field Magnetization Nuclear magnetic resonance chemistry Electrical resistivity and conductivity Phase (matter) Condensed Matter::Strongly Correlated Electrons Metal–insulator transition Inorganic compound Solid solution |
| Zdroj: | Europhysics Letters (EPL). 21:927-932 |
| ISSN: | 1286-4854 0295-5075 |
| DOI: | 10.1209/0295-5075/21/9/009 |
| Popis: | We have measured the magnetization of thick NbxSi1−x films as a function of temperature (T) and magnetic field (H) near the metal-insulator (MI) transition. In the insulating phase the susceptibility χ ∝ T−α with α ≈ 0.8 and both the T- and the H-dependence of χ are well described by a hierarchical spin-pairing model. In the metallic phase χ shows a similar power-law behavior with α ≈ 0.55, indicative of non-Fermi liquid behavior. We compare these results with similar measurements in doped semiconductors and with existing theories of the disordered insulating and metallic phases. The data suggest a decoupling of transport and magnetic behavior at the MI transition. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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