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Master's Dissertation
DOI
10.11606/D.43.1980.tde-26062015-162623
Document
Author
Full name
Mario Jairo Cazeca
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1980
Supervisor
Committee
Pereira Neto, Jose Rezende (President)
Paduan Filho, Armando
Qualifik, Paul
Title in Portuguese
Oscilações do nível do bismuto no limite de baixos números quânticos
Keywords in Portuguese
Física do estado sólido
Abstract in Portuguese
Realizamos medidas das oscilações do nível de Fermi do bismuto observando as variações do potencial de contato em um monocristal. As medidas foram feitas em diferentes temperaturas, e com o campo magnético variando de 0 ~ 20 KG, na direção binária dos eixos cristalográficos. As oscilações observadas nas curvas experimentais resultam da passagem dos níveis de Landau dos elétrons de massa efetiva leve pelo nível de Fermi. Oscilações menores também foram observadas num intervalo de 8 ~ 11 KG, que identificamos como sendo provenientes da passagem dos níveis de Landau dos buracos pelo níve1 de Fermi. A partir dos dados obtidos da curva experimental e usando o modelo V.P.D. (8), ajustamos uma curva teórica a partir da qual determinamos os parâmetros que caracterizam esse modelo.
Title in English
Oscillations of bismuth Fermi level in the low quantum numbers limit
Keywords in English
Solid state physics
Abstract in English
We have measured the Fermi level oscillations of bismuth by observing the contact potential variations of a monocrystal. The measurements were made at different temperatures, with applied magnetic field parallel to the binary direction of the crystallographic axes in the range 0 ~ 20 KG. The oscillations obtained from the experimental curves are the results of the passage of the Landau levels of the low effective mass electrons through the Fermi level. Small oscillations have also been observed within the range 8 ~ 11 KG which we identify as being due to the passage of the Landau levels of the holes through the Fermi level. From the data obtained from the experimental curve and by using the model V.P.D.(8), we fitted a theoretical curve from which we have determined the parameters that characterize this model.
 
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Cazeca_1980.pdf (3.72 Mbytes)
Publishing Date
2015-06-29
 
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