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The effects of Zn Impurity on the Properties of Doped Cuprates in the Normal State
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The effects of Zn Impurity on the Properties of Doped Cuprates in the Normal State
Yun Song
Department of Physics, Beijing Normal University, Beijing 100875, China
(February 2, 2008)
We study the interplay of quantum impurity, and collective
spinon and holon dynamics in Zn doped high-Tc cuprates in
the normal state. The two-dimensional t-t′-J models with one
and a small amount of Zn impurity are investigated within a
numerical method based on the double-time Green function
theory. We study the inhomogeneities of holon density and
antiferromagnetic correlation background in cases with differ-
ent Zn concentrations, and obtain that doped holes tend to
assemble around the Zn impurity with their mobility being
reduced. Therefore a bound state of holon is formed around
the nonmagnetic Zn impurity with the effect helping Zn to
introduce local antiferromagnetism around itself. The incom-
mensurate peaks we obtained in the spin structure factor in-
dicate that Zn impurities have effects on mixing the q=(π, π)
and q=0 components in spin excitations.
75.30.Hx, 74.72.-h, 74.20.Mn
The effects of divalent transition metal Zn substitute
for Cu in CuO2 plane present much valuable informa-
tion in understanding the mechanism of high tempera-
ture superconductors. Zn2+ has a closed d shell with spin
s = 0, and acts as a very strong scattering center. As a
result, the spin configurations and the electronic struc-
tures around the nonmagnetic impurity Zn are strongly
disrupted in both the normal state and superconduct-
ing state. Below Tc, there have been many experimen-
tal [1–5] and theoretical [6–10] investigations to discover
how the d-wave superconductivity is destroyed and what
is the microscopic mechanism behind. As the normal
state properties are more fundamental, some experimen-
tal [11–15] and theoretical [16–18] works have been done
to study the effects of nonmagne
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