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- 저자 : Stephan Haas (검색결과 2 건)
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Anatomy of Gossamer superconductivity
Stephan Haas,Kazumi Maki,Thomas Dahm,Peter Thalmeie 한국물리학회 2007 Current Applied Physics Vol.7 No.1
There are many systems in which two order parameters compete with each other. Of particular interest are systems in which theseorder parameters are both unconventional. In this contribution, we examine the representative example of a d-wave superconductorTc superconductors.The physical properties of unconventional superconductivity in the presence of an anisotropic charge density wave are investigatedwithin mean eld theory. This model describes many features that were anticipated by an earlier phenomenological treatment of Tallonand Loram. In addition, the quasiparticle density of states in the presence of these two order parameters is calculated, which should beaccessible by scanning tunneling microscopy
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Aspects of nodal superconductivity
Hyekyung Won,Stephan Haas,David Parker,Kazumi Maki 한국물리학회 2004 Current Applied Physics Vol.4 No.5
Until recently, the precise gap function Δ(k) of many nodal superconductors has been unknown. The most notable exception arethe high-temperature cuprate superconductors for which angular resolved photoemission spectroscopy and Josephson interfer-ometry have succeeded to clearly identify dx2. y2-wave symmetry. Unfortunately, it has turned out to be dicult to apply these methods to some of the other nodal superconductors. Recently it has been recognized that the quasiparticle spectrum of nodalsuperconductors in the vortex state is very sensitive to the symmetry of the gap function. In particular, Izawa et al. have succeeded inidentifying an f-wave order parameter in Sr2RuO 4, dx2. y2-wave order in CeCoIn5 and j -ðETÞ2Cu(NCS)2, and s+g-wave super-conductivity in YNi2B2C and PrOs4Sb12. In this paper we review some of the surprises that were encountered in this exploration.
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