Topic
High-temperature superconductivity
About: High-temperature superconductivity is a research topic. Over the lifetime, 7263 publications have been published within this topic receiving 175377 citations. The topic is also known as: high-temperature superconductivity.
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TL;DR: In this paper, the specific heat, spin susceptibility, spin-lattice relaxation time, and electrical resistivity of high-Tc superconductors were derived on the basis of a microscopic model composed of d- and p-electrons.
Abstract: Fermi liquid theory· is developed to discuss normal state properties of high- Tc superconductors (HTSC). On the basis of a microscopic model composed of d- and p-electrons, we derive the expressions for the specific heat, spin susceptibility, spin-lattice relaxation time T, and T2-term of electrical resistivity. By insisting consistency among these quantities, we can conclude that spin fluctuations in HTSC are localized in the momentum space in sharp contrast to heavy fermion systems, where spin fluctuations are localized in the real space. Starting with the rigorous expres sions derived above, and assuming large antiferromagnetic spin fluctuations in HTSC, we can naturally explain the temperature dependence ~f the resistivity and T,-' observed in the normal state of HTSC.
51 citations
TL;DR: Measurements of X-ray diffraction on small patches of a copper oxide superconductor reveal that oxygen crystal defects form fractal structures that seem to promote high-temperature superconductivity.
Abstract: Measurements of X-ray diffraction on small patches of a copper oxide superconductor reveal that oxygen crystal defects form fractal structures that seem to promote high-temperature superconductivity.
51 citations
TL;DR: In this article, the main results of a consistent study of electron-lattice interaction in crystals in the strong-coupling limit are discussed. But the authors focus on the superconductivity of the system.
Abstract: The review deals with the main results of a consistent study of electron-lattice interaction in crystals in the strong-coupling limit. Small polaron and bipolaron formation is shown to provide a number of new physical phenomena both in the normal and superconducting states of the system. Two mechanisms of superconductivity are discussed in detail. The first one arises from the Cooper pairing of small polarons in momentum space (polaron superconductivity). The second one is due to polaron pairing in real space leading to on-site or intersite bipolaron formation with superconductivity analogous to the superfluidity of 4He (bipolaron superconductivity). Highly non-adiabatic motion of (bi)polarons in the narrow band results in fundamental differences of their superconducting state properties with respect to the predictions of the BCS theory and its well known strong-coupling generalization. A number of basic properties of high-temperature metallic oxides being analyzed in terms of (bi)polaron theory of superconductivity is shown to reveal a satisfactory agreement of its findings with the available experimental data.
51 citations
TL;DR: The Nd1+xBa2-xCu3Oy system and its superconductivity were studied in this paper, where it was shown that there appears to be little influence of the magnetic ion Nd3+ on the Tc in the Nd 1 +xBa 2 -xCu 3 Oy system.
Abstract: The Nd1+xBa2-xCu3Oy system and its superconductivity were studied. This system forms a solid solution within the x range of 0.00 to 0.80. At room temperature, it has orthorhombic symmetry for x ranging from 0.00 to 0.14 and tetragonal symmetry for x not less than 0.20. All specimens at 900°C in air have tetragonal symmetry. It is a superconductor in the region of x less than 0.50. The superconducting onset temperature decreases from 93.5 to 40.0 K with increasing x. In comparison with the superconductivity of the La1+xBa2-xCu3Oy system, there appears to be little influence of the magnetic ion Nd3+ on the Tc in the Nd1+xBa2-xCu3Oy system.
51 citations
TL;DR: The volume pinning force of FeSe1−xTex in this direction is very strong compared with that of Co-doped BaFe2As2, due to a good matching between the interlayer distance in the c direction and the out-ofplane coherence length.
Abstract: Biaxially textured FeSe1−xTex films have been realized on Fe-buffered MgO substrates by pulsed laser deposition. Similar to the Fe/BaFe2As2 bilayers, the crystalline quality of FeSe1−xTex films exhibit a sharp out-of-plane and in-plane texture less than 0.9°. The Fe/FeSe1−xTex bilayers showed high superconducting transition temperatures of over 17 K. The angular-dependent critical current densities exhibit peaks positioned at H ⊥ c similar to other pnictide thin films. The volume pinning force of FeSe1−xTex in this direction is very strong compared with that of Co-doped BaFe2As2, due to a good matching between the interlayer distance in the c direction and the out-of-plane coherence length.
50 citations