1 / 7

Band structure of strongly correlated materials from the Dynamical Mean Field perspective

K Haule Rutgers University Collaborators : J.H. Shim & Gabriel Kotliar. Band structure of strongly correlated materials from the Dynamical Mean Field perspective. Fe, Ni. As, P. La,Sm,Ce. O. Iron based high-Tc superconductors. x~5-20%. Smaller c Higher T c.

tausiq
Download Presentation

Band structure of strongly correlated materials from the Dynamical Mean Field perspective

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. K Haule Rutgers University Collaborators : J.H. Shim & Gabriel Kotliar Band structure of strongly correlated materials from the Dynamical Mean Field perspective

  2. Fe,Ni As,P La,Sm,Ce O Iron based high-Tc superconductors x~5-20% Smaller c Higher Tc • Y. Kamihara et.al., Tokyo, JACS • X.H. Chen, et.al., Beijing, cm/0803.3790 • G.F. Chen et.al., Beijing, cm/0803.3603 • Z.A. Ren et.al, Beijing, unpublished • 2D square lattice of Fe • Fe - magnetic moment • As-plays the role of O in cuprates

  3. Kink in resistivity maybe SDW Specific heat consistent with nodes! Possibly d wave.. LaFxO1-xFeAs Y. Kamihara et.al., J. Am. Chem. Soc. XXXX, XXX (2008) A.S. Sefat. et.al., cond-mat/0803.2403

  4. LaFxO1-xFeAs • Undoped compound: • Huge resistivity • Huge spin susceptibility • (  >> 100 bigger than in LSCO • 50 x Pauli) • Doped compound: • Large resistivity >> opt. dop. Cuprates • Spin susceptibility of an almost free spins • ~C/(T+120K) with C of S~1 Wilson’s ratio R~1 F0a small Y. Kamihara, J. Am. Chem. Soc. XXXX, XXX (2008)

  5. x2-y2 60meV yz, xz 160meV z2 60meV xy LDA for LaOFeAs KH, J.H. Shim, G. Kotliar, cond/mat 0803.1279 LDA DOS LDA: phonons-Tc<1K LDA: Mostly iron bands at EF (correlations important) 6 electrons in 5 Fe bands: Filling 6/10

  6. Not a one band model: all 5 bands important (for J>0.3) DMFT for LaFxO1-xFeAs LDA+DMFT: LaOFeAs is at the verge of the metal-insulator transition (for realistic U=4eV, J=0.7eV) For a larger (U=4.5, J=0.7eV) Slater insulator Need to create a singlet out of spin and orbit

  7. Electron pockets around M and A upon doping Optical conductivity of a bad metal No Drude peak DMFT for LaFxO1-xFeAs In LaOFeAs semiconducting gap is opening Large scattering rate at 116K 10% doping T=116 K

More Related