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dc.contributor.advisorCheeke, David
dc.contributor.authorFernandez, Braulio J.
dc.date.accessioned2019-05-03T20:27:19Z
dc.date.available2019-05-03T20:27:19Z
dc.date.created1987
dc.date.issued1987
dc.identifier.isbn0315476850
dc.identifier.urihttp://hdl.handle.net/11143/15507
dc.description.abstractUltrasonic attenuation (x) as a function of bath temperature (0,1-100 K) and magnetic field (0-80 kG) has been measured in six n-type and four p-type InSb samples oriented along either the (111] or the [110] direction, and for longitudinal waves along the [111] or shear along the [110] direction in the range of 75 to 550 MHz. Samples excess carrier concentrations at 77 K ranged from 6,3x1013 to 7x1015 cm-3. Measurements of at very low temperatures confirm, in p-type samples, the existence of a temperature-induced relaxation peak and an attenuation decreasing with magnetic field. Inn-type we found a positive magnetic field-induced relaxation peak decreasing in amplitude and shifting towards lower fields as the temperature decreases. The results are well accounted for by the Hutson and White model. Free electrons and hopping are mainly responsible for the observed behaviour of the relaxation peaks as a function either of temperature or magnetic field. AC conductivity values derived from acoustic measurements agree not only with the existing models in the literature but also with our interpretation of the role played by the two forementioned processes in the Hutson and White model.
dc.language.isoeng
dc.publisherUniversité de Sherbrooke
dc.rights© Braulio J. Fernandez
dc.subjectUltrasons--Acoustique
dc.subjectSemi-conducteurs
dc.subjectPhysique de l'état solide
dc.titleUltrasonic attenuation in INSB at very low temperatures
dc.typeThèse
tme.degree.disciplinePhysique
tme.degree.grantorFaculté des sciences
tme.degree.levelDoctorat
tme.degree.namePh.D.


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