Nanoscale Electronic Disorder in Cuprate Superconductors

1
Nanoscale Electronic Disorder in Cuprate
Superconductors K. McElroy, E.W. Hudson, J. E.
Hoffman, K. M Lang, H Eisaki, S. Uchida J. C.
Seamus Davis
Bi2Sr2CaCu2O8d
Expected k-averaged DOS for a dx2-y2
Superconductor
Structure ofBi2Sr2CaCu2O8d
Cleave Here Reveals BiO Surface
70 Å
T 4.2K, B 0T 100pA, -100mV
GapMap Map of D as a function of location (on
an atomically resolved surface )
Evolution of Bi2Sr2CaCu2O8d gapmap with doping
Nanoscale phase separation?
Underdoped Tc 75 K
p 0.11
p 0.13
p 0.14
D
2D
75 mV
70 mV
0 Å 147 Å
30 mV
91126153 from typical linecut on Ni BSCCO
177/11113a00
180/20219a00
p 0.16
p 0.17
p 0.19
20 mV
600 Å
Nature 413, 282 (2001) Nature 415, 412 (2002)
Nature 415, 412 (2002)
K.M. Lang et al Submitted.
Gapmap
LDOS image near gap energy
Gapmap
Topograph
D
64 mV
20 mV
D
D
Commensurate q(2p/a0,0) modulations seen
only wherever ED(local)
20 mV
64 mV
20 mV
64 mV
D
D
20 mV
60 mV
E24mV
A)
B)
D
-24 mV
40Å
D)
C)
-50 mV
What happens inside one of these regions?
-34 mV
640 Å
640 Å
640 Å
23 nm
23 nm
Nature 422, 520 (2003).
Strong scattering and localization of antinodal
quasiparticles by nanoscale domains
Weak scattering of quasiparticles 5meVltElt30meV gt
quasiparticle interference
Strong scattering of nodal quasiparticles from
impurity atoms
A)
D
40Å
B)
ALL AT SAME LOCATION IN REAL SPACE !
-24 mV
Research Support