Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cu NQR study of host and guest spin dynamics in impurity-doped YBa2Cu4O8   We present the planar 63Cu nuclear spin-lattice relaxation study of
impurity-doped YBa2(Cu1-xMx)4O8 (M=Ni, Zn) at T=4.2-300 K with Cu nuclear
quadrupole resonance (NQR) spin-echo technique. In the light of an
impurity-induced NQR relaxation theory, we estimated the host Cu nuclear
spin-lattice relaxation time (T1)HOST, the impurity-induced Cu nuclear
spin-lattice relaxation time (t1), and the wipeout region around the impurity
in the superconducting state. The pseudo spin-gap behavior of the host Cu
antiferromagnetic spin fluctuation above Tc is not readily removed by a small
amount of the impurity. The Zn-induced non-Korringa behavior of (T1)HOST below
Tc is in sharp contrast to the doping effect of the magnetic impurity Ni.

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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th