A study of mechanical forces on Type I superconductors in a magnetic field

dc.contributor.advisorHouston, William V.en_US
dc.creatorSmith, David Robert, 1939-en_US
dc.date.accessioned2016-04-22T21:58:45Zen_US
dc.date.available2016-04-22T21:58:45Zen_US
dc.date.issued1966en_US
dc.description.abstractAn investigation of the mechanical forces on superconducting strips of indium about 10-1 cm in thickness and strips of vacuum deposited tin about 8 x 10°5 cm thick due to their passage through magnetic fields has been made with a torsion pendulum. At 4.2°K the thin films showed no observable eddy current damping, while the indium strips showed damping which increased with the magnetic field intensity. At temperatures corresponding to critical fields of about 50 gauss both materials showed damping which increased with the magnetic field intensity. This damping is clearly not due to eddy currents in the normal regions in the case of the tin films, since no eddy current damping was observed at 4.2°K. It is believed to be associated with the motion of normal superconducting boundaries and to the motion of flux lines against a resistive pinning force. An analysis of the data, assuming the dissipative force to be made up of a constant force plus a force proportional to the first power of the velocity with which the samples pass through the field regions, indicates that the constant force is about the same for the films and the strips for corresponding degrees of flux penetration. There was also evidence of a conservative force which tended to expel the samples from the field regions and produced a flux penetration barrier opposing the entrance of the samples into the field regions.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent85 ppen_US
dc.identifier.callnoThesis Phys. 1966 Smithen_US
dc.identifier.citationSmith, David Robert, 1939-. "A study of mechanical forces on Type I superconductors in a magnetic field." (1966) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/89848">https://hdl.handle.net/1911/89848</a>.en_US
dc.identifier.digitalRICE0882en_US
dc.identifier.urihttps://hdl.handle.net/1911/89848en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleA study of mechanical forces on Type I superconductors in a magnetic fielden_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentPhysicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Artsen_US
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