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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.

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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)



LEED patterns

Pb-BSCCO

YBCO

LSCO


Energy

w

W

w

Recipe

Bare band structure

Auger decay

Bosons


Self-energy

Energy

Energy


A

B

С

Agreement with experiment

B

A

C

Energy

Inosov, Zabolotnyy et al.


G (w,k)

INS

RAMAN

STM


LEED patterns

Pb-BSCCO

YBCO

LSCO


Chain states

Fermi surface of YBCO

O. K. Andersen et al.






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.


e-

e-

d=0.30

d=0.16


d=0.16

d=0.16

Edwards et al, Phys. Rev. Lett. 70, 2967 (1992)

d=0.02

d=0.30



Momentum dependence of the renormalization in YBCO-6.6

Momentum, kx

Momentum, ky

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.


Temperature dependence in Ca-YBCO.

2005 10 SLS\Ca-YBCO

files 014-21

V. Zabolotnyy et al.


hn=50eV

hn=53eV

hn=55eV

Kinks in YBCO: nodal direction

PRL 06 c


Kinks in YBCO: nodal direction

Momentum (Å-1)

PRL 06 c


P. Bourges, B. Keimer et al.

Kinks in YBCO as a function of doping

PRL 06 c


YBCO 30 K

Kordyuk et al. Cond-mat/0510760


Evidence for the strong

interband scattering in YBCO

PRL 06 b, PRL 06 c


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
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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