Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin dynamics in hole-doped two-dimensional S=1/2 Heisenberg
  antiferromagnets: ^{63}Cu NQR relaxation in La_{2-x}Sr_xCuO_4 for $x\leq
  0.04$   The effects on the correlated Cu^{2+} S = 1/2 spin dynamics in the
paramagnetic phase of La_{2-x}Sr_xCuO_4 (for $x \lesssim 0.04$) due to the
injection of holes are studied by means of ^{63}Cu NQR spin-lattice relaxation
time T_1 measurements. The results are discussed in the framework of the
connection between T_1 and the in-plane magnetic correlation length
$\xi_{2D}(x,T)$. It is found that at high temperatures the system remains in
the renormalized classical regime, with a spin stiffness constant $\rho_s(x)$
reduced by small doping to an extent larger than the one due to Zn doping. For
$x\gtrsim 0.02$ the effect of doping on $\rho_s(x)$ appears to level off. The
values for $\rho_s(x)$ derived from T_1 for $T\gtrsim 500$ K are much larger
than the ones estimated from the temperature behavior of sublattice
magnetization in the ordered phase ($T\leq T_N$). It is argued that these
features are consistent with the hypothesis of formation of stripes of
microsegregated holes.

22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: dg-ga