Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of large positive magnetoresistance and its sign reversal in
  GdRhGe   Magnetic properties, heat capacity and magnetoresistance (MR) of
polycrystalline GdRhGe are investigated. It shows two antiferromagnetic
transitions, one at T1=31.8 K and the other at T2=24 K, and field induced
metamagnetic transition over a wide temperature range. The ac susceptibility
data reveal that the transition at 24 K is not simple antiferromagnetic.
Dominant contributions to the heat capacity and the resistivity have been
identified. MR is found to show sign reversal just below T1 and attains a large
positive value of 48% at 2 K for 50 kOe. Like MR, the isothermal magnetic
entropy change also undergoes a sign reversal as the temperature is varied,
indicating a change of the magnetic structure and the moment amplitude in
determining these properties.

9
The categories of this paper are: nlin
2
The categories of this paper are: math
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio