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

Osofsky, Michael Steven

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https://hdl.handle.net/2142/25213 Copy

Description

Title

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

Author(s)

Osofsky, Michael Steven

Issue Date

1987

Doctoral Committee Chair(s)

Mochel, J.M.

Department of Study

Physics

Discipline

Physics

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

• spin-orbit scattering
• E-field
• disordered metals
• metal-insulator transition

Language

en

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< 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.

Type of Resource

text

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http://hdl.handle.net/2142/25213

Copyright and License Information

1987 Michael Steven Osofsky

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