Kinks, Nodal Bilyaer Splitting, and

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Kinks, Nodal Bilyaer Splitting, and Interband
Scattering in YBCO
Sergey V. Borisenko
Self-organized Strongly Correlated Electron
Systems 29 May, 2006, Seillac, France
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THANKS TO
Alexander Kordyuk
Martin Knupfer
Andreas Koitzsch
Jörg Fink
Volodymyr Zabolotnyy
Bernd Büchner
Dmitriy Inosov
Jochen Geck
Roland Hübel
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THANKS TO
Bernhard Keimer, Chengtian Lin, Vladimir
Hinkov MPI Stuttgart Yoichi Ando, Shimpei Ono,
Seiki Komiya CRIEPI Tokyo Andreas Erb WMI
Garching Helmut Berger EPFL Lausanne Rolf
Follath BESSY Sorin Chiuzbaian, Luc
Patthey SLS Andrey Chubukov U
Wisconsin Ilya Eremin MPI Dresden Money DF
G (Forschergruppe 538) BMBF ("Highest resolution
ARPES") EU (LSF Programme)
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Angle-Resolved Photoemission Spectroscopy
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LEED patterns
Pb-BSCCO
YBCO
LSCO
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Recipe
Bare band structure
Auger decay
Bosons
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Self-energy
Energy
Energy
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Agreement with experiment
B
A
C
Energy
Inosov, Zabolotnyy et al.
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G (w,k)
STM
RAMAN
INS
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LEED patterns
Pb-BSCCO
YBCO
LSCO
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Fermi surface of YBCO
O. K. Andersen et al.
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Fermi surface of YBCO
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Electronic structure of YBCO
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Electronic structure of YBCO
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Nodal bilayer splitting
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Some of the previous work on YBCO
Chain/SS
Chain
antibonding
bonding
K. Gofron et al., J. Phys. Chem. Solids 54, 1193
(1993)
?
M. C. Schabel et al., Phys. Rev. B 57, 6090 (1998)
SC peak
hump
Surf. State
Chain
D. H. Lu et al., Phys Rev. Lett 86, 4370 (2001)
D. H. Lu et al., Phys Rev. Lett 86, 4370 (2001)
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YBCO Gap? Doping level?
YBCO 6.85
N
A
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Electronic structure of YBCO
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Temperature dependence.
V. Zabolotnyy et al.
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Superconducting component
bonding
antibonding
overdoped
sum
experiment
superconducting
// Model 0.5(ABSC ABN) BBSC BBN
Background
V. Zabolotnyy et al.
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d0.30
d0.16
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d0.02
d0.30
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12 A
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Momentum dependence of the renormalization in
YBCO-6.6
Momentum, kx
Momentum, ky
V. Zabolotnyy et al.
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Superconducting gap anisotropy
V. Zabolotnyy et al.
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Momentum dependence in Ca-YBCO
200510 SLS\Ca-YBCO
Momentum, kx
Momentum, ky
Experiment
Model
V. Zabolotnyy et al.
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Temperature dependence in Ca-YBCO.
2005 10 SLS\Ca-YBCO files 014-21
V. Zabolotnyy et al.
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Kinks in YBCO nodal direction
PRL 06 c
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Kinks in YBCO nodal direction
Momentum (Å-1)
PRL 06 c
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Kinks in YBCO as a function of doping
PRL 06 c
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Kordyuk et al. Cond-mat/0510760
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Evidence for the strong interband scattering in
YBCO
PRL 06 b, PRL 06 c
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Conclusions
Methodological conclusions ARPES spectra of
YBCO consist of two components a strongly
overdoped one (top bilayer) and a nominally
doped one (second bilayer) There are no other
misterious surface states It is possible to
enhance the nominally doped component (photon
energy, polarization, geometry, Ca-doping)
Physical conclusions Fermi surface of YBCO is
consistent with LDA predictions (bilayer
splitting, chain states, shape,
topology) Renormalization below Tc is strong and
anisotropic Superconducting gap has the absolute
values comparable to BSCCO and similar
anisotropy Kink energy is doping dependent and
tracks that of the magnetic excitations
spectrum Strong interband scattering, as in
BSCCO, indicates that the scattering mediators
are the spin fluctuations
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Thanks to
ARPES of HTSC, Leibniz-IFW Dresden Alexander
Kordyuk, Andreas Koitzsch, Vladimir Zabolotnyy,
Jochen Geck, Dmitriy Inosov, Roland Hübel, Jörg
Fink, Martin Knupfer, Bernd Büchner
Synchrotron Light Rolf Follath BESSY
BerlinLuc Patthey SLS Villigen
Collaboration Bernhard Keimer, Vladimir Hinkov,
Chengtian Lin MPI Stuttgart Yoichi Ando, Shimpei
Ono, Seiki Komiya CRIEPI Tokyo Andrey
Chubukov U Wisconsin Ilya Eremin MPI
Dresden Andreas Erb WMI Garching Helmut
Berger EPFL Lausanne
Funding DFG (Forschergruppe 538), EU (LSF
Programme)