pseudogap: broken particle-hole symmetry gap (rounded) phase transition
DESCRIPTION
pseudogap: broken particle-hole symmetry gap (rounded) phase transition. superconducting state: SC gap distorted by PG. next step: what is PG? what is the role of PG for SC?. Bi2201 doping dependence ARPES: determine q , spectral weight, comparison with other experiments. - PowerPoint PPT PresentationTRANSCRIPT
pseudogap:broken particle-hole symmetry gap
(rounded) phase transition
superconducting state: SC gap distorted by PG
next step:what is PG?
what is the role of PG for SC?
• Bi2201 doping dependence– ARPES: determine q, spectral weight, comparison
with other experiments.– x-ray scattering, transport, Kerr effect, time-
resolved reflectivity, …• Bi2212– effect of PG on SC. mode coupling. enhancement
of SC by PG?
Pb-Bi2212 OP 98 K, Antinode, Antibonding Band, hn = 18.4 eV
auto correlation ARPES:gap function from STM is not accurate
photon energy dependence:don’t evaluate back-ground!
back ground subtraction
not but
3D fit2D
22 )),((Im)),(Re)((),(Im)/1(),,(),(
n
kkkkAhkMkI
22 ))((Im)),(Re)(()(Im)/1()(),(
kk
kMkI
true spectral weightdoping dependence of Imhigh-energy anomalyRIXS auto correlation
RIXS
E
130°
q
IN
OUT
Sample
E
unoccupied statemagnon?bimagnon?band dispersion?
LSCO LBCOnode
other plans
• Doping dependence of SC gap in overdoped Bi2212
• 16 eV• polarization dependence
Hg-2201, 2212, 2223
Bi2223
LBCO, Nd-LSCO, Fe-LSCO
our future plan• Electron-doped cuprates
– I think we should ask Felix to give a short talk about what can be interesting topics for next step. SC gap? Effects of AF.
• Eliashberg eqn– We’ll discuss this topic next time.
• LSCO– I’ll ask Ruihua what his future plan on LSCO is. Probably one of us should take over his project. In addition to
the extension of his experiments, nodal gap, overdoped sample, high-resolution experiments on LSCO families are interesting.
• Overdoped sample– PG goes into SC dome? FS topology? SC gap?
• Disordered sample– Bi2201, Bi2212? I will see Hiroshi Eisaki (sample grower) next week. I’ll discuss if this is interesting project.
maybe related to nodal gap. Also effects on the pseudogap can be studied based on recent our finding on PG.• Tl based cuprates, YBCO,
– For YBCO, we have to get rid of surface problem. If we can get reliable data, there are a lot of literatures on YBCO which we can compare.
– For Tl-2201, I’m interested in this material because it has higher Tc as a single layer cuprate.