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DESCRIPTION:Joe Thompson\, LANL\n\nThe discovery of superconductivity in Ce
Cu2Si2 \nnearly 20 years ago was totally unexpected
and contradicted \nfundamental tenants of the well-established BCS theory
of \nsuperconductivity. Instead of the magnetic moment carried \nby Ce+3 s
uppressing superconductivity\, as expected from \nBCS\, the presence of Ce
was essential for superconductivity \nand responsible for increasing the
effective mass of the \nelectrons participating in superconductivity by \n
orders-of-magnitude-hence\, heavy-fermion superconductivity. \nAs we now k
now\, CeCu2Si2 was the first example of \nsupercondu
ctivity mediated by antiferromagnetic spin \nfluctuations\, which also may
be the dominant pairing \nmechanism in high-temperature superconductors\,
and other \nparallels between heavy-fermion and cuprate \nsuperconductivi
ty are emerging. Recently\, we have \ndiscovered a new family of heavy-fer
mion materials\, CeMInsub5 \n(M=Rh\, Co\, and Ir)\, in which su
perconductivity appears at \ntemperatures higher than in any other heavy-f
ermion system. \nThese materials form in a quasi-2D structure\, which make
s \nan analogy with the cuprate's magnetism and \nsuperconductivity appeal
ing. Though much remains to be \nlearned about their properties\, this new
family appears to \nbe quite interesting and provocative.
DTSTART:20001020T200000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Superconductivity in a New Family of Heavy-Fermion Compounds
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