Rorschach, Harold E., Jr.2016-04-222016-04-221967Wells, Charles Allie. "Magnetization measurements near the superconducting transition temperature." (1967) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/89881">https://hdl.handle.net/1911/89881</a>.https://hdl.handle.net/1911/89881The thermodynamically reversible phase transition of a metal into a superconducting state has a critical field curve, which can be represented by: The difference in the specific heat of the two phases is given by These equations predict a first order phase transition in a magnetic field and a second order transition in zero field. A singularity in the specific heat at Tc, similar to the singularity for liquid heldum at the -point due to the onset of long range order, would mean that A system of measuring the magnetization of a superconductor in an applied field has been constructed and utilized to determine the critical field curve near The system consists of a closed superconducting loop enclosing the sample, a nulling solenoid and a magnetometer probe; situated in a region of low nagnetic fields. Magnetization curves have been obtained for a sample of 99.999% pure indium over a temperature range of 3.365°K to 3.398°K. The reversibility of the curves was found to depend on the rate at which the magnetic field was applied. The critical temperature was found to be 3.409°K. The slope (dHc/dT) for measurements made was -150 oe./°K. The agreement between values found from this experiment and previous work was reasonable. There was no indication of a singularity in the temperature range investigated. [see PDF for formulas]39 ppengCopyright 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.ThesisRICE0915reformatted digitalThesis Phys. 1967 Wells