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Title: An experimental study of paramagnetic susceptibility at low temperatures
Author: Duffus, H. J.
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 1953
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We have investigated the microwave absorption spectra of cerium, praseodymium, neodymium and samarium in magnesium double nitrate at 4.2°K. We have also measured the bulk susceptibility of a nitric oxide clathrate and of potassium manganicyanide from 4.2°K to 300°K. We used a 3 cm reflex klystron microwave spectrometer, obtaining temperatures down to 1.5°K by the use of fee liquid helium. A large water-cooled electromagnet produced homogeneous fields of up to 15 kilogauss which were usually measured by an ammeter showing the current through the coils. In order to measure the field accurately very close to the specimen at 4.2°K, but it was too broad to be very useful. The bulk susceptabilities were measured by means of a Sucksmith ring balance which covered the temperatures range from 2°K to 300°K by use of the free liquid helium, hydrogen and oxygen. The ring deflections were measured by means of two opposing selenium photocells in series with a sensitive galvanometer used as a null detector. The force on the specimen was produced by the imhomogeneous field of an air-cooled electromagnet. We were unable to obtain a field of suitable symmetry to measure the highly anisotropoc crystals.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available