Magnetic ordering in the layered oxyselenides Sr 2 CoO 2 Ag 2 Se 2 and Ba 2 CoO 2 Ag 2 Se 2
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منابع مشابه
Crystal Structure of the Superconducting Layered Cobaltate Na X Coo 2 ·yd 2 O Crystal Structure of the Superconducting Layered Cobaltate Na X Coo 2 ·yd 2 O
We have used electron diffraction and neutron powder diffraction to elucidate the structural properties of superconducting Na x CoO 2 ·yD 2 O over a wide compositional range. Our measurements show that superconducting samples exhibit a number of supercells ranging from 1 3 a * to 1 15 a * , but the predominant modulation, observed also in the neutron data, is a double hexagonal cell with dimens...
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We synthesized powder samples of NaxCoO2 · yH2O changing the volume of the water in the hydration process, then investigated their superconducting properties,. It was proved that the volume of water is one of key parameters to obtain a single phase of NaxCoO2 · yH2O with good superconducting properties. The transition temperature, Tc, of the sample changed gradually while it was stored in the a...
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We construct an effective Hamiltonian for the motion of t2g highly correlated states in NaxCoO2. This three-band model includes the indirect Co–O–Co hopping t and the crystal-field splitting 3D. Calculations in a CoO6 cluster give the effective parameters t = 100 meV and 3D = 315 meV. The Hamiltonian is solved using a generalized slave-boson mean-field approximation. The results show a signific...
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A novel two-dimensional coordination polymer Zn(tda)H2O [tda = S(CH(2)COO)2(2-)] was synthesized under hydrothermal conditions. The compound crystallized in monoclinic space group P2(1) with a = 16.4154(17) A, b = 5.2133(6) A, c = 16.4210(17) A, beta = 114.165(2) degrees , V = 1282.1(2) A3, and Z = 8. The structure features two-dimensional, noncentrosymmetric networks with a pseudohexagonal net...
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ژورنال
عنوان ژورنال: Journal of Solid State Chemistry
سال: 2018
ISSN: 0022-4596
DOI: 10.1016/j.jssc.2018.05.018