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    Superconductivity and small magnetic fields

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    Author
    Hendricks, John Benjamin
    Date
    1964
    Advisor
    Rorschach, Harold E., Jr.
    Degree
    Master of Arts
    Abstract
    The use of the flux-gate,magnetometer as a sensitive measuring inastrument for investigating the magnetic properties of superconductors is discussed. The construction of a magnetometer is described and an analysis of the system is included. The magnetic properties considered are the Meissner effeat, the "London field", and quantized trapped magnetic flux. The reasults of a Meissner effect experiment are given. In this case, an Indium sample is placed inside a hollow Tin cylinder in a uniform external magnetic field. The temperature is lowered until the cylinder becomes superconducting. The magnetic flux within the cylinder is then a constant, and as the sample becomes superconducting, the field inside the cylinder will rise. This transition can be detected with the magnetometer. Three critical points were obtained, and compared to recent measurements by Shaw, Mapother, and Hopkins. The three points were Tc = 3.394°K @ H=1.174 Gauss, Tc=3.367°K @H=4.859 Gauss, and Tc = 3.330°K @ H=11.92 Gauss. The comparison gave errors of -10, -8, and 0 millidegrees, respectively. To make the comparison to the data by Shaw, et. al., a least squares fit to their data was made using a standard computer program. The critical curve can be represented by, Hc = 284.39 -26.751 Tc2 + 0.096352 Tc4
    Citation
    Hendricks, John Benjamin. "Superconductivity and small magnetic fields." (1964) Master’s Thesis, Rice University. https://hdl.handle.net/1911/89869.
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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map