Gossamer Superconductivity, New Paradigm.pdf

a r X i v : c o n d - m a t / 0 5 0 8 2 3 4 v 1 [ c o n d - m a t .s u p r - c o n ] 9 A u g 2 0 0 5 pss header will be provided by the publisher Gossamer Superconductivity, New Paradigm? Hyekyung Won ?1 , Stephan Haas 2 , Kazumi Maki 2,3 , David Parker 2 , Balazs Dora 4 , and Attila Virosztek 4,5 1 Department of Physics, Hallym University, Chuncheon 200-702, South Korea 2 Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484 USA 3 Max-Planck Institute for the Physics of Complex Systems, No?thnitzer Str. 38, D-01187, Dresden, Ger- many 4 Department of Physics, Budapest University of Technology and Economics, H-1521, Budapest, Hungary 5 Research Institute for Solid State Physics and Optics, P.O. Box 49, H-1525 Budapest, Hungary Key words cuprate, d-wave superconductivity, d-wave density wave PACS 74.70.-b We shall review our recent works on d-wave density wave (dDW) and gossamer superconductivity (i.e. d- wave superconductivity in the presence of dDW) in high-Tc cuprates and CeCoIn5. a) We show that both the giant Nernst effect and the angle dependent magnetoresistance (ADMR) in the pseudogap phases of the cuprates and CeCoIn5 are manifestations of dDW. b) The phase diagram of high-Tc cuprates is understood in terms of mean field theory, which includes two order parameters ?1 and ?2, where one order paremeter is from dDW and the other from d-wave superconductivity. c) In the optimally to the overdoped region we find the spatially periodic dDW, an analogue of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, becomes more stable. d) In the underdoped region where ?2/?1 ? 1 the Uemera relation is obtained within the present model. We speculate that the gossamer superconductivity is at the heart of high-Tc cuprate superconductors, the heavy-fermion superconductor CeCoIn5 and the organic superconductors κ- (ET)2Cu(NCS)2 and (TMTSF)2PF6. Copyright line will be provided by the publisher 1 Introduction Question: What does