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Spin-orbit scattering and E-field effects in discordered metals near the metal-insulator transition

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Title: Spin-orbit scattering and E-field effects in discordered metals near the metal-insulator transition
Author(s): Osofsky, Michael Steven
Doctoral Committee Chair(s): Mochel, J. M.
Department / Program: Physics
Discipline: Physics
Degree: Ph.D.
Genre: Dissertation
Subject(s): spin-orbit scattering E-field disordered metals metal-insulator transition
Abstract: The results of two studies of disordered metals near their metal-insulator transition are presented: (i) A detailed comparison of GexAu1-x and BxCu1-x is carried out in zero magnetic field. GeAu, a high Z material, has been shown to e xh1bit strong spin-orbit effects in a magnetic field while 8Cu, a low Z material, has been shown to exhibit weak spin-orbit effects. Both materials have similar temperature dependent de conductivity behavior in zero field and approximately linear mobility edges; CiilA detailed stud~ of the non-linear dc conductivitu of GeAu and Cx - Cu1-x is carried out for 1.3K<<T<4.2K and for E-fields up to 500V/ cm. Analyzing the o <E> data in the context of an electron gas heating model fields unphysically long electron relaxation times. Alternatively, the E-field can limit renormalization by raising the electron energy above the disordered potential. The s~stem then changes from quantum mechanical scaling to classically diffusive behavior beyond a certain length scale . The temperature and E-field data can then give the characteristic lengths and prefactors for the transition.
Issue Date: 1987
Genre: Dissertation / Thesis
Type: Text
Language: English
Rights Information: 1987 Michael Steven Osofsky
Date Available in IDEALS: 2011-06-02
Identifier in Online Catalog: 1411790

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