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CAMP: Search the Genes of Unconventional High Temperature Superconductors

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Jiangping Hu, Purdue University
01 September 2015 from 3:30 PM to 4:30 PM
339 Davey Laboratory
Contact Name
Chaoxing Liu
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We  discuss two basic principles to unify the understanding of both cuprates and iron-based superconductors: (1) the  correspondence principle— the short range magnetic exchange interactions and the Fermi surfaces act collaboratively to achieve high Tc  superconductivity and determine pairing symmetries;  (2)  the selective magnetic pairing rule:  the superconductivity is only induced by the magnetic exchange couplings from the superexchange mechanism  through cation-anion-cation chemical bondings but not those from direct exchange couplings resulted from the direct cation's d-d chemical bondings.  These two principles  provide an unified explanation why the d-wave pairing symmetry and the s-wave pairing symmetry are robust respectively in cuprates and iron-based superconductors.  In the meanwhile,  the above two principles  can serve as  direct guiding rules to search   new unconventional high Tc superconductors.  We propose that the third classes of unconventional  high  Tc superconducting candidates  in compounds formed by cation-anion trigonal bipyramidal complexes with a d7 filling configuration  on the cation ions.   Their superconducting states are expected to  be dominated by  the  d+id  pairing symmetry.  Synthesizing these compounds and verifying the prediction can convincingly establish the high Tc superconducting mechanism and pave a way to design new high Tc superconductors