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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

Where are the superconductors?

Z. Fisk, UC Irvine

Digital Synthesis Workshop

Boston University

September 27, 2013

Supported by AFOSR MURI

1986 the new superconductors
1986: the new superconductors

La1.84Sr0.16CuO4 Tc = 40K

the new superconductors pnictides t c 56k
the new superconductors: pnictides Tc = 56K

Wolfgang Jeitschko

2006 Hirano; 2008 Jorend

what is common here
What is common here?
  • all based on electron precise materials
  • charge separated layers
  • electronically anisotropic
bcs type a15 superconductivity
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
highest t c found in proximity to competing localized phase
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

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