1 / 31

Nodal gaps (LSCO) and Nodal kinks (Bi2212)

Nodal gaps (LSCO) and Nodal kinks (Bi2212). Yu He SC Meeting Aug 30, 2013. Figures. Fig.1 k-dependence Fig.2 doping dependence Fig.3 T-dependence Fig.4 phase diagram. Kinks in UD(22) and OD(92,80,65) Bi2212. Doping dependence (UD&OD) T-dependence Bi2201, Bi2212 and LSCO

alessa
Download Presentation

Nodal gaps (LSCO) and Nodal kinks (Bi2212)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Nodal gaps (LSCO) and Nodal kinks (Bi2212) Yu He SC Meeting Aug 30, 2013 • Figures Fig.1 k-dependence Fig.2 doping dependence Fig.3 T-dependence Fig.4 phase diagram • Kinks in UD(22) and OD(92,80,65) Bi2212 • Doping dependence (UD&OD) • T-dependence • Bi2201, Bi2212 and LSCO • Where are we?

  2. 7% LSCO 10% LSCO Fig.1 Gap structure in k-space b AN a c N Sr 0.03 Sr 0.12 Sr 0.07 f d e

  3. Fig.2 Doping dependent nodal gap

  4. Fig.3 T-dependence for SC samples l

  5. Fig.4 phase diagram

  6. Kiyohisa Tanaka et al. Science 314, 1910 (2006) Sugai et al., PHYSICAL REVIEW B 68, 184504 (2003)

  7. Energy Hierarchy in HTSC ‘kinkology’ 8~16meV Low energy kink 40~50meV Subkink Main kink 60~70meV ~400meV High energy kink

  8. Nodal gaps (LSCO) and Nodal kinks (Bi2212) Yu He SC Meeting Aug 30, 2013 • Figures Fig.1 k-dependence Fig.2 doping dependence Fig.3 T-dependence Fig.4 phase diagram • Kinks in UD(22) and OD(92,80,65) Bi2212 • Doping dependence (UD&OD) • T-dependence • Bi2201, Bi2212 and LSCO • Where are we?

  9. Kinks in various families

  10. Doping perspective LSCO Bi2212 Bi2201 UD OD OD UD Low energy kink ??? Subkink* ? Main kink*

  11. Doping perspective Bi2212 Bi2201 0 -0.2 Abnormal high energy selfE line shape Explain abnormally large off-nodal selfE

  12. Momentum perspective (O/UD89 Bi2212, Dessau) Node -> Antinode: Ekink decreases Re[Sig] and 1st derivative of Im[Sig] consistent Cutting angle correction not significant within this range Data collected at SSRL

  13. Momentum perspective (O/UD89 Bi2212, Dessau) High energy spin fluctuation dispersion looks less inconsistent

  14. Momentum perspective (OD80/73 Bi2212, IOP) Node -> Antinode: Ekink similar k-dependence Main kink stays (lower white stripe), suggestion strong k-selective coupling vertex g(w,k) ‘unexplainable’ subkink dispersion Extrapolated subkink sits on top of AN gap at (pi,0)! Band bottom ~ 50meV Kink position ~ 70meV Strong renormalization?? Bonding band?

  15. Temperature perspective

  16. Kinks in OP96 Bi2212 Lee Wei-Sheng et al., PHYSICAL REVIEW B 77, 140504(R) (2008)

  17. OD82 Bi2212 Subkink stronger off-node (more separated from main kink) Subkink disappear cross above Tc

  18. OD80 Bi2212 50K 50K Tc ~ 80K Tc ~ 80K 130K 130K

  19. OD65 Bi2212 – self energy

  20. OD65 Bi2212 Warming up Tc = 65K

  21. UD22 Bi2212 UD22 OD65 I.M. Visik et al., PNAS 109, 18332(2012)

  22. Bi2212 – nodal kink phase diagram (M)ain kink (S)ub kink (L)ow energy kink 50K 2 kinks Tc ~ 80K 130K 1 kink No drastic change shift in position OR change in intensity? 1 kink 2 kinks Indiscernible 1 kink

  23. Universality ?? 7% LSCO 10% LSCO

  24. Universality ?? Low E kink has layer dependence? Coupling stronger in Bi2201 (lower Tc)? Subkink contribution smaller/more separated to low energy in Bi2212?

  25. Where are we in kink-space? Layer dependence, BB and AB(7eV) – hv dependence Deeply OD 2212 Subkink disappear? Mainkink still there? (Dessau LSCO) Quantitative T-dep for [-80,-60]meV, [-50,-40]meV, [-20,-5]meV Band curvature correction Band bottom even shallower at AN - renormalization k

  26. The END

  27. UD22 and OD65 Bi2212 – Luttinger counting?

  28. Supplementary 12% LSCO 10% LSCO antinode node 1% LSCO 3% LSCO 5% LSCO 7% LSCO

  29. 7% LSCO 7% LSCO 10% LSCO

  30. More on 7%, 8% and 10% 7% LSCO 8% LSCO 10% LSCO Tc ~19K Tc ~24K Tc 13K 11K

  31. Symmetry argument d+s wave Gap size (meV) Δd fixed at 40meV; line nodes with Δs = 0, 10, 20, 40, 60meV respectively Θdeg d+is wave Gap size (meV) W.A. Atkinson et al., PRL 109, 267004 (2012) Θdeg

More Related