4ß ì@g w µ@fû pfég /²8 #ú8 fþ s4@ ö%Ê'2 · 2015-10-02 · cbm sto lao s4fþ 3q z...
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---
Ueno et al.Nature Nanotech.
(2011)
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( )
pm
relaxed surf.
Ideal surf.
AFM, STM---CTR---
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X
Elec
tron
dens
ity (/
Å3 )
X
-shape scattering (CTR scattering)
( ): CTR
c*Q-space
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CTR --- X
sub---
0 2 4 6 8 10 12 14 160.0
2.0x106
4.0x106
L
(00L)
0 2 4 6 8 10 12 14 16100
102
104
106
108In
tens
ity (a
rb. u
nits
)
L
(00L)X
LAO/STOFilm sample
Nakagawa et al. Nature Materials(2006)
AO/SSS
cross-sectional HAADF-STEM image
TEM
Yamamoto, YW , PRL 107 036104 (2011)
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CTR(LaNiO3/LaAlO3)
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5101
102
103
104
105
106
Inte
nsity
L
(01L) LNO/LAO
bulk surface
Fitting parameterz for A, B, O1 and O2 (10 u.c.): 40La/Sr ratio, Al/Ti ratio : 16Occupancy of first 2 layers: 4Total number of parameters : 60
LaAlO3/SrTiO3n
100101102103104105106107108109
(00 )
Intensity
Exp. Fit
0 1 2 3 4 5100101102103104105106107108 (01 )
Intensity
(r.l.u.)
Exp. Fit
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bulk surface
LaAlO3/SrTiO3p
0 1 2 3 4 5100101102103104105106107108109
Inte
nsity
(01 )
(r.l.u.)
Exp. Fit
100101102103104105106107108109
Inte
nsity
Exp. Fit(00 )
CBM
STO LAO-6 -4 -2 0 2 4 6
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
p-typeDisp
lace
men
t (Å)
z (unit cell)
-6 -4 -2 0 2 4 6-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
metal oxygen
ABO1O2
Disp
lace
men
t (Å)
z (unit cell)
n-type
(b)
(a) O1
O2 B
z E
E
CBM
STO LAO
n STO
p STO
n
STO
R.Yamamoto, Y.W. et al. PRL 107 036104 (2011).
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R. Pentcheva and W.E. Pickett,PRL (2009). U. Schwingenschloegl and C. Schuster,
EPL (2009).
Z.S. Popovic et al., PRL (2008).
P in LAOTi moves to surf.
P in STO
LaAlO3/SrTiO3
P.R.Willmott et al. Phys. Rev. Lett. (2007).
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s-like bands p-like bands d-like bands
TiO2SrO LaTiO3 1
••
PF 3A 3 SPring-8 BL13XU 1 2
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[5]phenacenerubrene
Nature Commun. , 3A, (2014)
Ideal surf.
relaxed surf.
2 3 4 5 6 7 8100
101
102
103
104
105
106
107
Inte
nsity
L(r.l.u)
Expideal model
(00L)
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Bulk phase Thin film phase
Surface structure of tetracene
Pentacene polymorphs
(GGA)
Surface structure of tetracene
Exp.
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H.Morisaki, T.Koretsune, C.Hotta,J.Takeya, T.Kimura and Y.Wakabayashi,Nature Commun. 5 5400 (2014).
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(Ishii et al. PRB 85, 245206(2012)ps )
CTR
(2 0 L) (9/4 1/4 L)
1.96 1.98 2.00 2.02 2.04-0.2
0.0
0.2
0.4
0.6
0.8
1.0 (9/4 1/4 L)
Norm
alize
d In
tens
ity
k
L=2 L=0.2
(2 0 0.2)OO=410Å
170K
Y.W. et al. Nature Materials 6, 972 (2007)
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XPCS
Gustafson et al., Science 343, 758 (2014).
•PF•PF SGU " "•SPring-8 "
X
XPCS