Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The metal-insulator transition of the ferromagnetic La7/8Sr1/8MnO3
  probed by spin waves: a 2D stripe superstructure   We report a study of spin waves in hole-doped ferromagnetic La7/8Sr1/8MnO3,
in the metallic state (165K) below TC (181K) and through the puzzling
metal-insulator transition which occurs at TO'O''=159K. They reveal very
unusual excitations. Propagating spin waves are observed in the small q-range
up to q=0.25 (lambda=4a), and, beyond, four dispersionless levels. Both types
of excitations have a quasi two-dimensional (2D) character. The transition is
revealed by a folding of the dispersed magnon branch at q=1/8. In the metallic
state, the dispersionless levels reveal ferromagnetic domains with 4 lattice
spacings for their size along a and b. They lead to a picture of charge
segregation with hole-poor domains surrounded with hole-rich paths. Within this
description, the transition appears as the ordering of domains, which can be
interpreted in terms of a 2D superstructure of orthogonal stripes.

30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph