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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

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Kinks nodal bilyaer splitting and interband scattering in ybco

Kinks, Nodal Bilyaer Splitting, and

Interband Scattering in YBCO

Sergey V. Borisenko

“Self-organized Strongly Correlated Electron Systems”

29 May, 2006, Seillac, France


Kinks nodal bilyaer splitting and interband scattering in ybco

THANKS TO:

Alexander Kordyuk

Martin Knupfer

Andreas Koitzsch

Jörg Fink

Volodymyr Zabolotnyy

Bernd Büchner

Dmitriy Inosov

Jochen Geck

Roland Hübel


Kinks nodal bilyaer splitting and interband scattering in ybco

THANKS TO:

Bernhard Keimer, Chengtian Lin, Vladimir HinkovMPI Stuttgart

Yoichi Ando, Shimpei Ono, Seiki KomiyaCRIEPI Tokyo

Andreas ErbWMI Garching

Helmut BergerEPFL Lausanne

Rolf FollathBESSY

Sorin Chiuzbaian, Luc PattheySLS

Andrey ChubukovU Wisconsin

Ilya EreminMPI Dresden

Money

DFG (Forschergruppe 538)

BMBF ("Highest resolution ARPES")

EU (LSF Programme)


Kinks nodal bilyaer splitting and interband scattering in ybco

Angle-Resolved Photoemission Spectroscopy


Kinks nodal bilyaer splitting and interband scattering in ybco

LEED patterns

Pb-BSCCO

YBCO

LSCO


Kinks nodal bilyaer splitting and interband scattering in ybco

Energy

w

W

w

Recipe

Bare band structure

Auger decay

Bosons


Kinks nodal bilyaer splitting and interband scattering in ybco

Self-energy

Energy

Energy


Kinks nodal bilyaer splitting and interband scattering in ybco

A

B

С

Agreement with experiment

B

A

C

Energy

Inosov, Zabolotnyy et al.


Kinks nodal bilyaer splitting and interband scattering in ybco

G (w,k)

INS

RAMAN

STM


Kinks nodal bilyaer splitting and interband scattering in ybco

LEED patterns

Pb-BSCCO

YBCO

LSCO


Kinks nodal bilyaer splitting and interband scattering in ybco

Chain states

Fermi surface of YBCO

O. K. Andersen et al.


Kinks nodal bilyaer splitting and interband scattering in ybco

Fermi surface of YBCO


Kinks nodal bilyaer splitting and interband scattering in ybco

Electronic structure of YBCO


Kinks nodal bilyaer splitting and interband scattering in ybco

Electronic structure of YBCO


Kinks nodal bilyaer splitting and interband scattering in ybco

Nodal bilayer splitting


Kinks nodal bilyaer splitting and interband scattering in ybco

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)


Kinks nodal bilyaer splitting and interband scattering in ybco

YBCO: Gap? Doping level?

YBCO 6.85

~N

~A


Kinks nodal bilyaer splitting and interband scattering in ybco

19 meV

Electronic structure of YBCO


Kinks nodal bilyaer splitting and interband scattering in ybco

Temperature dependence.

V. Zabolotnyy et al.


Kinks nodal bilyaer splitting and interband scattering in ybco

Superconducting component

antibonding

bonding

overdoped

sum

experiment

superconducting

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

V. Zabolotnyy et al.


Kinks nodal bilyaer splitting and interband scattering in ybco

e-

e-

d=0.30

d=0.16


Kinks nodal bilyaer splitting and interband scattering in ybco

d=0.16

d=0.16

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

d=0.02

d=0.30


Kinks nodal bilyaer splitting and interband scattering in ybco

~12 A


Kinks nodal bilyaer splitting and interband scattering in ybco

Momentum dependence of the renormalization in YBCO-6.6

Momentum, kx

Momentum, ky

V. Zabolotnyy et al.


Kinks nodal bilyaer splitting and interband scattering in ybco

Superconducting gap: anisotropy

V. Zabolotnyy et al.


Kinks nodal bilyaer splitting and interband scattering in ybco

Momentum dependence in Ca-YBCO

200510 SLS\Ca-YBCO

Momentum, kx

Momentum, ky

Experiment

Model

V. Zabolotnyy et al.


Kinks nodal bilyaer splitting and interband scattering in ybco

Temperature dependence in Ca-YBCO.

2005 10 SLS\Ca-YBCO

files 014-21

V. Zabolotnyy et al.


Kinks nodal bilyaer splitting and interband scattering in ybco

hn=50eV

hn=53eV

hn=55eV

Kinks in YBCO: nodal direction

PRL 06 c


Kinks nodal bilyaer splitting and interband scattering in ybco

Kinks in YBCO: nodal direction

Momentum (Å-1)

PRL 06 c


Kinks nodal bilyaer splitting and interband scattering in ybco

P. Bourges, B. Keimer et al.

Kinks in YBCO as a function of doping

PRL 06 c


Kinks nodal bilyaer splitting and interband scattering in ybco

YBCO 30 K

Kordyuk et al. Cond-mat/0510760


Kinks nodal bilyaer splitting and interband scattering in ybco

Evidence for the strong

interband scattering in YBCO

PRL 06 b, PRL 06 c


Kinks nodal bilyaer splitting and interband scattering in ybco

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 FollathBESSY BerlinLuc PattheySLS Villigen

Collaboration

Bernhard Keimer, Vladimir Hinkov, Chengtian LinMPI Stuttgart

Yoichi Ando, Shimpei Ono, Seiki Komiya CRIEPI Tokyo

Andrey ChubukovU Wisconsin

Ilya EreminMPI Dresden

Andreas ErbWMI Garching

Helmut BergerEPFL Lausanne

Funding

DFG (Forschergruppe 538), EU (LSF Programme)


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