Por favor, use este identificador para citar o enlazar este ítem:
https://repositorio.ufba.br/handle/ri/14667
metadata.dc.type: | Artigo de Periódico |
Título : | Metal-insulator transition and superconductivity in boron-doped diamond |
Otros títulos : | Physical Review B |
Autor : | Klein, T. Achatz, P. Kacmarcik, J. Marcenat, C. Gustafsson, F. Silva, Antonio Ferreira da Cytermann, C. |
metadata.dc.creator: | Klein, T. Achatz, P. Kacmarcik, J. Marcenat, C. Gustafsson, F. Silva, Antonio Ferreira da Cytermann, C. |
Resumen : | We report on a detailed analysis of the transport properties and superconducting critical temperatures of boron-doped diamond films grown along the {100} direction. The system presents a metal-insulator transition (MIT) for a boron concentration (nB) on the order of nc∼4.5×1020cm−3, in excellent agreement with numerical calculations. The temperature dependence of the conductivity and Hall effect can be well described by variable range hopping for nB<nc with a characteristic hopping temperature T0 strongly reduced due to the proximity of the MIT. All metallic samples (i.e., for nB>nc) present a superconducting transition at low temperature. The zero-temperature conductivity σ0 deduced from fits to the data above the critical temperature (Tc) using a classical quantum interference formula scales as σ0∝(nB/nc−1)ν with ν∼1. Large Tc values (⩾0.4K) have been obtained for boron concentration down to nB/nc∼1.1 and Tc surprisingly mimics a (nB/nc−1)1/2 law. Those high Tc values can be explained by a slow decrease of the electron-phonon coupling parameter λ and a corresponding drop of the Coulomb pseudopotential μ∗ as nB→nc. |
metadata.dc.publisher.country: | Brasil |
metadata.dc.rights: | Acesso Aberto |
URI : | http://repositorio.ufba.br/ri/handle/ri/14667 |
Fecha de publicación : | 2007 |
Aparece en las colecciones: | Artigo Publicado em Periódico (FIS) |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
10.1103-PhysRevB.75.165313.pdf | 216,93 kB | Adobe PDF | Visualizar/Abrir |
Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.