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Where are the superconductors?

Where are the superconductors?. Z. Fisk, UC Irvine Digital Synthesis Workshop Boston University September 27, 2013 Supported by AFOSR MURI. (from J. Schilling). timeline of maximum superconducting transition temperature T c. 1986: the new superconductors.

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Where are the superconductors?

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  1. Where are the superconductors? Z. Fisk, UC Irvine Digital Synthesis Workshop Boston University September 27, 2013 Supported by AFOSR MURI

  2. (from J. Schilling)

  3. timeline of maximum superconducting transition temperature Tc

  4. 1986: the new superconductors La1.84Sr0.16CuO4 Tc = 40K

  5. the new superconductors: pnictides Tc = 56K Wolfgang Jeitschko 2006 Hirano; 2008 Jorend

  6. What is common here? • all based on electron precise materials • charge separated layers • electronically anisotropic

  7. competing order

  8. M. Nicholas et al. Phys. Rev. B 76, 052401 (2007)

  9. generic cuprate phase diagram

  10. BCS-type A15 superconductivity • Peierls-type lattice distortion above Tc • strong coupling of soft lattice mode to conduction electrons • no lattice distortion when Tc occurs first

  11. Batterman and Barrett Phys. Rev. 145, 296 (1966)

  12. Schilling V3Si: TMartensitic / Tc

  13. highest Tc found in proximity to competing “localized” phase • holds for BCS, heavy Fermions, organics, cuprates and pnictides • the competing phase, afm in heavy Fermions, terminates where it intersects the Tcboundary and does not extend into the superconducting phase • “localized”: in BCS, lattice distorted; in heavy Fermions, local moment magnetism; in cuprates, the psuedo-gap phase. • electronics highly non-adiabatic • superconductivity runs in structures

  14. superconductivity appears as solution to unloading entropy of fluctuations • gaps out lower frequency fluctuations • It seems plausible that a connection between structure, character of fluctuations and superconductivity exists

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