Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetocaloric effect in Ni2(Mn,Cu)Ga0.84Al0.16 Heusler alloys   Polycrystalline Heusler compounds Ni2Mn0.75Cu0.25Ga0.84Al0.16 with a
martensitic transition between ferromagnetic phases and
Ni2Mn0.70Cu0.30Ga0.84Al0.16 with a magnetostructural transformation were
investigated by magnetization and thermal measurements, both as a function of
temperature and magnetic field. The compound Ni2Mn0.75Cu0.25Ga0.84Al0.16
presents a large magnetocaloric effect among magnetically aligned structures
and its causes are explored. In addition, Ni2Mn0.70Cu0.30Ga0.84Al0.16 shows
very high, although irreversible, entropy and adiabatic temperature change at
room temperature under a magnetic field change 0-1 T. Improved refrigerant
capacity is also a highlight of the 30% Cu material when compared to similar
Ni2MnGa-based alloys.

37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
1
The categories of this paper are: cs