<p> Magnetic susceptibility data indicate that Tb2Mo2O7 undergoes a spin glass
transition at 25 K. The crystal structure is consistent with the fully ordered pyrochlore
model. Short range order, involving ferromagnetic and antiferromagnetic correlations,
is observed down to 8 K by neutron scattering. </p> <p> Sr2Cr03F and SrLaCr04 have the same magnetic structure. The neutron
diffraction data are consistent with two different models. In both cases the magnetic
cell is √2a and c and the magnetic moments lie out of the plane. However, in one
model the in-plane projection is canted and in the other it is colinear. Sr2Cr03F has a
Tc value of 132(2) K and a susceptibility maximum at 280 K. SrLaCr04 has a Tc
value of approximately 200 K and a susceptibility maximum near 400 K. The critical·
exponent β for Sr2Cr03F is 0.26(4). The (100) magnetic reflection of both SrLaCr04
and Sr2Cr03F shows short range order correlations above Tc. </p> / Thesis / Master of Science (MSc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/19205 |
| Date | 09 1900 |
| Creators | Penny, Sarah |
| Contributors | Greedan, J. E., Chemistry |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
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