Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-Order Superconducting Transition of Sr2RuO4   By means of the magnetocaloric effect, we examine the nature of the
superconducting-normal (S-N) transition of Sr2RuO4, a most promising candidate
for a spin-triplet superconductor. We provide thermodynamic evidence that the
S-N transition of this oxide is of first order below approximately 0.8 K and
only for magnetic field directions very close to the conducting plane, in clear
contrast to the ordinary type-II superconductors exhibiting second-order S-N
transitions. The entropy release across the transition at 0.2 K is 10% of the
normal-state entropy. Our result urges an introduction of a new mechanism to
break superconductivity by magnetic field.

9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an