PIRSA:09040021 Conference

DOI10.48660/09040021

Conference/School: 4 Corners Southwest Ontario Condensed Matter Symposium

Coleman, P. (2009). Composite pairing in the new “high Tc” Heavy Fermion Superconductors. Perimeter Institute. https://pirsa.org/09040021

Coleman, Piers. Composite pairing in the new “high Tc” Heavy Fermion Superconductors. Perimeter Institute, Apr. 23, 2009, https://pirsa.org/09040021 

@misc{ pirsa_PIRSA:09040021,
  doi = {10.48660/09040021},
  url = {https://pirsa.org/09040021},
  author = {Coleman, Piers},
  keywords = {},
  language = {en},
  title = {Composite pairing in the new \“high Tc\” Heavy Fermion Superconductors},
  publisher = {Perimeter Institute},
  year = {2009},
  month = {apr},
  note = {PIRSA:09040021 see, \url{https://pirsa.org}}
}

Abstract

'The discovery in 1996 of superconductivity at 0.2K near a magnetic quantum phase transition in CeIn3 opened a new dynasty of superconducting heavy electron materials, with many peculiar parallels to cuprate superconductors. In 2000, the introduction of additional layers of XIn_2, led to the discovery of the so-called ''115'' superconductors, with a tenfold increase in Tc[1]. By 2002, the replacement of Ce by Pu, drove the Tc up by an additional order of magnitude to 18.5K[2]. The recent discovery of a second material in this family has further deepened the mystery. In this talk I'll discuss the two newest ''high temperature'' heavy fermion superconductors in this series: PuCoGa5 and NpPd_2Al_5. These materials radically challenge the way we think about strongly correlated superconductivity. The way these materials directly transition from Curie paramagnets into anisotropic superconductors suggests a central role of spin as a driver for heavy electron superconductors - not just as the pairing glue - but as the basic fabric of the condensate. Motivated by these new materials, I'll discuss a model for superconductivity in the highest temperature superconductors in which the superconducting condensate involves formation of composite pairs between spins and conduction electrons[3]. Using this idea, we'll discuss how the physics of superconductivity and the Kondo effect can be combined, giving rise to a composite pairing model for the new superconductors. [1]}H. Hegger, C. Petrovic, E. G. Moshopoulou, M. F. Hundley, J. L. Sarrao, Z. Fisk, and J. D. Thompson, ''Pressure-Induced Superconductivity in Quasi-2D $CeRhIn_{5}$'' Phys. Rev. Lett. 84, 4986-4989 (2000). [2]J. L. Sarrao et al. , ``Plutonium-based superconductivity with a transition temperature above 18 K'', Nature (London) {bf 420}, 297-299 (2002). [3] Rebecca Flint, M. Dzero, P. Coleman, ''Heavy electrons and the symplectic symmetry of spin.'', Nature Physics 4, 643 - 648 (2008).Nature Physics, '

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