By the technique of adiabatic demagnetization, paramagnetic
salts may be cooled to temperatures less than .1°K. By good thermal contact between crystals and paramagnetic salts, the antiferromagnetics MnSiF₆.6H₂0 and CoC1₂.6H₂0 were cooled to temperatures at which the
hyperfine interaction energy of an introduced Mn⁵⁴ impurity was comparable to kT. This resulted in a preferential
population distribution of the available energy states. The alignment of nuclear spin, induced by the crystalline field present at the active Mn⁵⁴ impurity, was measured by the anisotropic distribution of the ƴ-rays given off by the radioactive Mn⁵⁴. This data led to a determination of the crystalline field acting on the impurity ion in MnSiF₆.6H₂0 and to verification
of theoretical calculations representing the anisotropy of ƴ-emission as a function of absolute temperature. Also by means of such data, a determination was made of the axes of alignment in the antiferromagnetic, CoC1₂.6H₂0 . / Science, Faculty of / Physics and Astronomy, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/40124 |
| Date | January 1960 |
| Creators | Griffiths, David J. |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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