Hierarchy of multiple many-body interaction scales in high-temperature superconductors Page: 3 of 7
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
2
0.0 - - - - - - - --
-0.5
1.5
06 00 02 0.5
Y ,n) r0,0) M-t,)k(2az/a)
0 E= 4eV E 45eV
1 0- -i
band B band 8
I..
06 00
Y IE,= 55eV
MDC peak position(2nta)
bd
LLMDC width(A")
ii 0-- - -_
0 2 -e D 2 ds 3
k(2a/a)FIG. 2: The comparison of normalized ARPES spectra and
LDA calculations along (a) (7, 7r) to (0,0) or nodal direction
and (b) (0,0) to (7r, 0) or antinodal direction in OD non-
superconducting Bi2201 system. (c) shows the agreement of
ARPES spectrum and LDA calculation of high-energy band
when shifting the LDA by 450 meV to the higher energy. (d)
The comparison of the spectra at photon energies, E~ = 40, 45
and 55 eV where the green shaded region denotes the energy
scale of HEA and blue shaded region indicates the top of the
band B. We note that for E~ = 55 eV, due to the matrix
element effect, the intensity of the left band B is large and
therefore we have adjusted the color scale so that we can see
the energy scales of both band A and B clearly.
A. anomalous enhancement of the LDA-based
CuO2 band width
As shown in Fig. le-1h, ARPES spectra of optimally-
doped (OP) and overdoped (OD) samples of Bi2201 and
Bi2212 systems are overlaid on the corresponding LDA
calculations. As seen in all measured samples, the first
peculiar feature, especially at lower doping, is that the
ARPES band width is found to be wider than LDA calcu-
lation. This is anomalous as one expects interactions to
enhance the mass and reduce the band width. By extrap-
olating the band (e.g. the red dashed line in Fig. Id), one
can get an estimate of the band width that is suitable for
qualitative discussion. With doping, the discrepancy be-
tween the band widths obtained from ARPES and LDA
seems to be reduced.
Additional evidence that these high energy dispersions
still contain useful information comes from band B in Fig.
la which shows a maximum at F point near 1 eV. This
band has a correspondence to an LDA band and thusFIG. 3: (a) shows MDC-peak dispersion plotted on top of
ARPES spectrum and (b) shows corresponding MDC width
in OP Bi2201 system (T, = 35K). (c)-(f) show the MDC-
derived dispersions of Bi2201 (Tc = 35K). Bi2212 (Tc=65K),
LSCO(Tc=38K) and F0234 (Tc=60K) respectively. Addi-
tionally, the temperature dependence of Bi2212 and LSCO
dispersion is shown in (d) and (f).
provides confidence in the data at higher energy scales,
which has been largely unexplored in the cuprates. From
the LDA calculation with orthorhombic distortion, this
band is the band at Y point (left arrow, Fig. 2c), which
is folded around the (7r/2,7/2) point. We then compare
the LDA and ARPES top part of this band B at F point
by shifting the LDA band down. A good agreement of
ARPES and LDA of this concave-down band (see Fig.
2c) can be obtained if the LDA is shifted down 0.45
eV for OD Bi2201 sample and the shifted energy increases
to ~ 0.8 eV for OP Bi2201 sample17, leading to a filled
band width near 2 eV. A similar behavior is also observed
in the Bi2212 system17 (Fig. 1g-h). This band width en-
hancement was also seen earlier in undoped Ca2CuO2Cl2
(CCOC) as its high-energy dispersion matches with the
LDA calculation shifted by 0.7 eV".
B. high energy anomaly of 0.3-0.5 eV
Next, we discuss the high energy anomaly (HEA) near
0.3-0.5 eV. We extract the MDC peak position by fit-
ting to Lorentzian curves, as shown by the red and blue
curves in Fig. 2a and 2b. We note that especially at
high-binding energy, MDC peak position may not rep-3
W.
W
Upcoming Pages
Here’s what’s next.
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Hussain, Zahid; Meevasana, W.; Zhou, X. J.; Sahrakorpi, S.; Lee, W. S.; Yang, W. L. et al. Hierarchy of multiple many-body interaction scales in high-temperature superconductors, article, December 21, 2006; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc896380/m1/3/: accessed March 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.