Dependence of Band Renormalization Effect on the Number of Copper-oxide Layers in Tl-based Copper-oxide Superconductor using Angle-resolved Photoemission Spectroscopy Page: 4 of 4
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Momentum, k - kF (-1)
FIG. 5: Band dispersions of T1-1223 near the Fermi surface
along the cuts indicated in the upper-right panel.
As also shown in Fig. 4 (d), the peak-dip-hump struc-
ture in EDCs is also seen in the similar momentum space
range on fermi surface. We note that the smaller antin-
odal quasiparticle peak and higher spectral background
observed in T1-1223 system are perhaps due to the rough
cleaved surface. T1-1223, unlike T1-2201 and T1-2212,
does not have a natural cleaving plane in the crystal
structure in which the T1-O layer is shared by unit cells
along c-axis. We remark that the observed momentum
dependent renormalization in multi-layer Tl-based com-
pounds (T1-2212 and T1-1223) is similar to those observed
in the optimally-doped multi-layer Bi-based cuprates, in-
cluding Bi-2212 [1, 5] and Bi-2223 [4, 6], where the renor-
malization effect along the entire Fermi surface is domi-
nated by an energy scales near 70 meV in the supercon-
Therefore, the most intriguing finding of this work is
the distinct momentum dependence of the renormaliza-
tion effect between single layer and multi-layer Tl-based
cuprates. This finding has an important implication on
the origin of the mode responsible for the observed renor-
malization effect. The lack of a strong renormalization
effect in the antinodal region in the single layer T1-2201
system strongly suggests that spin resonance mode is not
the origin of band renormalization effect near the antin-
odal region, since the spin-resonance mode does exist in
the T1-2201 compound  and supposedly, should yield
a strong renormalization near the antinodal region. This
also casts strong doubts on the assignment of the antin-
odal region renormalization effect seen in Bi-2212 and
Bi-2223 to the spin resonance mode [2, 3].
. ---..** .... .....**. ..,..
------------- -0--- --------0 ----0--------
-0o.1 0 o.0 0.o1 -0 '1 0. 0.' -0.2 -0'1 0.0 0.1
-0'1 0'0 '0.1 '-0'1 '0o.0 '0.1
C-axis phonons, on the contrary, can behave very dif-
ferently in single layer CuO2 plane systems compared to
multi-layer systems due to the environment surrounding
the CuO2 planes. For single layer materials, the CuO2
plane lies in a mirror plane and thus c-axis vibrations of
the CuO2 plane can only couple to electrons to the sec-
ond order of the atoms' displacements. Once the mirror
plane symmetry is broken, such as in the multilayer sys-
tems, a coupling to the local c-axis field is possible at first
order. In this way, the coupling of electrons to c-axis Ra-
man modes (such as the A19 and B19 oxygen phonons) in
single vs. multilayer cuprates are qualitatively different
[18, 19]. In particular, it has been demonstrated that the
Big buckling phonon is capable of producing the renor-
malization feature observed in multi-layer compounds ,
which best explains the layer number dependent renor-
malization observed in family of Tl-cuprates. Finally,
we remark that this B19 buckling model favors to form
Cooper pairs in the d-wave channel , which could be
one of the factors to induce a higher T, in multi-layer
SSRL is operated by the DOE Office of Basic Energy
Science, Division of Chemical Science and Material Sci-
ence. This work is supported by DOE Office of Science,
Division of Materials Science, with contract DE-AC02-
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Lee, Wei-Sheng. Dependence of Band Renormalization Effect on the Number of Copper-oxide Layers in Tl-based Copper-oxide Superconductor using Angle-resolved Photoemission Spectroscopy, article, June 2, 2010; [California]. (digital.library.unt.edu/ark:/67531/metadc1013839/m1/4/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.