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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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Journal ArticleDOI
TL;DR: In this paper, a range of complementary scanning electron microscope based techniques, including high-resolution electron backscatter diffraction mapping, were used to assess local variations in composition and lattice parameter with high precision and sub-micron spatial resolution.
Abstract: The interplay between superconductivity, magnetism and crystal structure in iron-based superconductors is a topic of great interest amongst the condensed matter physics community as it is thought to be the key to understanding the mechanisms responsible for high temperature superconductivity. Alkali metal doped iron chalcogenide superconductors exhibit several unique characteristics which are not found in other iron-based superconducting materials such as antiferromagnetic ordering at room temperature, the presence of ordered iron vacancies and high resistivity normal state properties. Detailed microstructural analysis is essential in order to understand the origin of these unusual properties. Here we have used a range of complementary scanning electron microscope based techniques, including high-resolution electron backscatter diffraction mapping, to assess local variations in composition and lattice parameter with high precision and sub-micron spatial resolution. Phase separation is observed in the CsxFe2?ySe2?crystals, with the minor phase distributed in a plate-like morphology throughout the crystal. Our results are consistent with superconductivity occurring only in the minority phase.

41 citations

Journal ArticleDOI
TL;DR: In this article, the authors measured the reflectivity spectra of YBa 2 Cu 3 O y for various oxygen content and found that the plasma edge shifts towards lower energy with decreasing oxygen content, hence with decreasing T c.
Abstract: The plasma reflectivity spectra of YBa 2 Cu 3 O y were measured for various oxygen content y . It was found that the plasma edge shifts towards lower energy with decreasing oxygen content y , hence with decreasing T c . This result is discussed, together with the result on the Hall coefficient, based on the Mott-Hubbard and the Fermi liquid picture. It turns out that the latter is appropriate to explain the plasmon behavior in the oxide superconductors. Comparing the plasma frequencies ω p of other oxide superconductors, we find the linear relation between ω 2 p and T c , which cannot be explained by the BCS-theory.

41 citations

Journal ArticleDOI
TL;DR: In this article, thin films of superconductors Yb-Ba-Cu-O were prepared by 50 Hz ac sputtering technique and the critical temperatures for onset and zero resistivity were 93 K and 66 K, respectively.
Abstract: Thin films of superconductors Yb-Ba-Cu-O were prepared by 50 Hz ac sputtering technique. The critical temperatures for onset and zero resistivity were 93 K and 66 K, respectively. The metal compositions and crystal structures of the films were controlled by varying such preparation conditions as sputtering gas, target composition, and substrate temperature and their relations with superconductivity were investigated.

41 citations

Journal ArticleDOI
TL;DR: In this paper, a new material, holmium-barium-copper oxide, becomes a superconductor and its onset temperature of the superconductivity is 93 K and the resistance vanishes below 76 K.
Abstract: A new material, holmium-barium-copper oxide, becomes a superconductor. Its onset temperature of the superconductivity is 93 K and the resistance vanishes below 76 K. By microwave SQUID method, a diamagnetism is found at 4.2 K.

41 citations

Journal ArticleDOI
TL;DR: In this article, superconductivity at 91.5 K in single crystals of the compound YBa2Cu3Ox, Debye-Scherrer X-ray patterns shows an orthorhombic structure with a=3.82 A, b = 3.88 A, c=11.67 A.

41 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202334
202258
202169
202084
201987
201883