Electronic Fine Structure in the Electron-Hole Plasma in SrB6
Electron-hole mixing-induced fine structure in alkaline earth hexaborides leads to lower energy (temperature) scales, and thus a stronger tendency toward an excitonic instability than in their doped counterparts (viz. Ca₁₋ₓ LaₓB₆, x≈0.005\), which are high-Curie-temperature, small-moment ferromagnet...
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| Autores principales: | , , |
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| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
| Publicado: |
2000
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/95717 https://ri.conicet.gov.ar/11336/71729 https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.84.3903 |
| Aporte de: |
| Sumario: | Electron-hole mixing-induced fine structure in alkaline earth hexaborides leads to lower energy (temperature) scales, and thus a stronger tendency toward an excitonic instability than in their doped counterparts (viz. Ca₁₋ₓ LaₓB₆, x≈0.005\), which are high-Curie-temperature, small-moment ferromagnets. Comparison of Fermi surfaces and spectral distributions with de Haas–van Alphen, optical, transport, and tunneling data indicates that SrB₆ remains a fermionic semimetal down to (at least) 5 K, rather than forming an excitonic condensate. For the doped system the Curie temperature is higher than the degeneracy temperature. |
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