MAGNETISM ELECTRON TRANSPORT MAGNETORESISTIVE LANTHANUM CALCIUM MANGANITE

T 2 Coefficient (10 -6 /K 2 )
Critical Behavior and Anisotropy in Single Crystal SrRuO 3
50
40
30
20
10
-10
0 25 50 75 100 125 150
Maximum Temperature of Fitting Range
ferromagnets such as ZrZn 2 , Ni 3 Al and Sc 3 In, show n = 2 [86, 193-195] over a
wide temperature range.
0
As shown above (Figure A- 6) the magnetization of SrRuO 3 single crystal
can be well described by M = M S (1 - (T/Θ n ) n ) with n = 2 in the temperature
range of reliable measurement, 5 K to 100 K. A fit with n = 3/2 in this
temperature range is unsatisfactory.
B parameter in fit to M = M 0 (1 - AT 3/2 - BT 2 )
7T T 2 term
6T T 2 term
5T T 2 term
4T T 2 term
3T T 2 term
2T T 2 term
1T T 2 term
2kOe T 2 term
1kOe T 2 term
Figure A- 9. Variation of the T 2 parameter in fitting the
magnetization data of single crystal SrRuO 3 to M = M S (1 -
AT 3/2 - BT 2 ) as the fitting range is increased. In the region
where B is relatively stable (around T max = 60 K), B increases as
T max is lowered.
If one assumes n = 2 arises from Stoner excitations and collective
excitations result in n = 3/2, then one may expect the variation of
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