Magnetoresistance behavior of UNiGe Page: 4 of 8
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In the present investigation we have extended our magnetoresistance studies on UNiGe,
which had been restricted to the parallel configuration (i/B//c-axis) at 4.2 K previously.5,6
The experimental results were obtained on two samples, which were cut along the a and c
axis,were about 5 mm in length and had cross-sectional areas of less than 1 mm2. Contacts
for the transport measurements were established by silver paint. Although the sensitivity of
the measuring apparatus is much better, the absolute accuracy of the measurements may be
as great as 5% due to errors in the determination of the geometrical factor and/or possible
microcracks present in the samples. Both samples were oriented with the c axis parallel to
the applied magnetic field in the 20 T superconducting magnet of the National High
Magnetic Field Laboratory at Los Alamos. The temperature dependences of the electrical
resistivity were exclusively measured during cooling from about 85 K (paramagnetic
region) down to 6.5 K with a cooling rate of about 20 K/h. In this way, the effects arising
from changes in the domain populations are thought to be well defined.
3. Magnetoresistance studies
First, we measured the variation of the electrical resistivity for both i//a and i//c during a
field sweep up to 18 T with B//c at T = 6.5 K (Fig. 1). For both configurations, we
observe abrupt changes in the electrical resistivity at magnetic fields around 3.7 and 9.5 T.
Previous magnetization studies revealed metamagnetic transitions at the same fields
reflecting subsequent changes in the magnetic structure.
0 5 10 15 20
Figure 1: Field dependence of the electrical resistivity of UNiGe for B//c-axis and i//a-axis
(triangles) and i//c-axis (circles) at 6.5 K. The solid line represents the magnetoresistance
at 4.2 K for i//B//c-axis taken from ref. 5.
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Nakotte, H.; Lacerda, A.; Purwanto, A.; Havela, L.; Sechovsky, V.; Prokes, K. et al. Magnetoresistance behavior of UNiGe, report, May 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc702566/m1/4/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.