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Kinks, Nodal Bilyaer Splitting, and Interband Scattering in YBCO

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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

THANKS TO:

Alexander Kordyuk

Martin Knupfer

Andreas Koitzsch

Jörg Fink

Volodymyr Zabolotnyy

Bernd Büchner

Dmitriy Inosov

Jochen Geck

Roland Hübel

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

DFG (Forschergruppe 538)

BMBF ("Highest resolution ARPES")

EU (LSF Programme)

S

Г

X

Y

S

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)

19 meV

Electronic structure of YBCO

Temperature dependence.

V. Zabolotnyy et al.

Superconducting component

antibonding

bonding

overdoped

sum

experiment

superconducting

// Model: =0.5*(ABSC + ABN) + BBSC + BBN + Background

V. Zabolotnyy et al.

Superconducting gap: anisotropy

V. Zabolotnyy et al.

Momentum dependence in Ca-YBCO

200510 SLS\Ca-YBCO

Momentum, kx

Momentum, ky

Experiment

Model

V. Zabolotnyy et al.

YBCO 30 K

Kordyuk et al. Cond-mat/0510760

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

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 LinMPI 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)

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