Inter-Orbital Effects in the Impure Pnictide Superconductors
نویسندگان
چکیده
منابع مشابه
Orbital and spin effects for the upper critical field in strongly disordered iron pnictide superconductors
We report upper critical field Bc2(T ), resistivity, and Hall data for disordered (arsenic deficient) LaO0.9F0.1FeAs1−δ in a wide temperature and high field range up to 60 T. Due to the large linear initial slope of Bc2 ≈ -5.4 to -6.6T/K near Tc ≈ 28.5 K the T -dependence of the in-plane Bc2(T ) shows a clear flattening already near 23 K above 30 T which is intepreted as the onset of a Pauli-li...
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We introduce and study an extended "t-U-J" two-orbital model for the pnictides that includes Heisenberg terms deduced from the strong coupling expansion. Including these J terms explicitly allows us to enhance the strength of the (π,0)-(0,π) spin order which favors the presence of tightly bound pairing states even in the small clusters that are here exactly diagonalized. The A(1g) and B(2g) pai...
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The puzzling nature of magnetic and lattice phase transitions of iron pnictides is investigated via a first-principles Wannier function analysis of representative parent compound LaOFeAs. A rare ferro-orbital ordering is found to give rise to the recently observed highly anisotropic magnetic coupling, and drive both phase transitions--without resorting to widely employed frustration or nesting ...
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A recently developed theory for the problem of Andreev reflection between a normal metal (N) and a multiband superconductor (MBS) assumes that the incident wave from the normal metal is coherently transmitted through several bands inside the superconductor. Such splitting of the probability amplitude into several channels is the analogue of a quantum waveguide. Thus, the appropriate matching co...
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ژورنال
عنوان ژورنال: Acta Physica Polonica A
سال: 2010
ISSN: 0587-4246,1898-794X
DOI: 10.12693/aphyspola.118.356