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 article, the superconducting properties of 1-unit-cell FeSe/STO have been extensively studied in condensed matter physics, and the potential mechanisms of the enhanced superconductivity are discussed.
Abstract: Since the dramatic enhancement of the superconducting transition temperature (T c) was reported in a one-unit-cell FeSe film grown on a SrTiO3 substrate (1-UC FeSe/STO) by molecular beam epitaxy (MBE), related research on this system has become a new frontier in condensed matter physics. In this paper, we present a brief review on this rapidly developing field, mainly focusing on the superconducting properties of 1-UC FeSe/STO. Experimental evidence for high-temperature superconductivity in 1-UC FeSe/STO, including direct evidence revealed by transport and diamagnetic measurements, as well as other evidence from scanning tunneling microscopy (STM) and angle-resolved photoemission spectroscopy (ARPES), are overviewed. The potential mechanisms of the enhanced superconductivity are also discussed. There are accumulating arguments to suggest that the strengthened Cooper pairing in 1-UC FeSe/STO originates from the interface effects, specifically the charge transfer and coupling to phonon modes in the TiO2 plane. The study of superconductivity in 1-UC FeSe/STO not only sheds new light on the mechanism of high-temperature superconductors with layered structures, but also provides an insight into the exploration of new superconductors by interface engineering.
64 citations
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TL;DR: A zero resistance transition temperature of 108 K has been achieved for Pb-doped BiSr•Ca•Cu•O superconductors prepared by conventional powder solid state reaction as discussed by the authors.
Abstract: A zero resistance transition temperature of 108 K has been achieved for Pb‐doped Bi‐Sr‐Ca‐Cu‐O superconductors prepared by conventional powder solid‐state reaction. The materials contained both the high Tc phase (Bi2Sr2Ca2Cu3Ox) and the low Tc phase (Bi2Sr2Ca1Cu2Ox). Critical current density at 100 K in a zero magnetic field was 3.5 A/cm2 which was larger than that of the Pb‐free sample.
64 citations
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TL;DR: In this article, high-resolution structure image of the high-Tc phase (Tc~107 K) showed that there are layer structural units with 15.4 A and 22.5 A in thickness.
Abstract: X-ray powder diffraction patterns and transmission electron diffraction patterns of superconductors with the nominal composition of BiSrCa3Cu4Ox have been observed and compared with the results of the magnetic susceptibility. Unit cell dimensions of high-Tc phase (Tc~107 K) are a=5.40 A, b=27.0 A, c=36.8 A, indicating a pseudotetragonal symmetry. High resolution structure image of the high-Tc phase shows that there are layer structural units with 15.4 A and 22.5 A in thickness, in addition to the main layer structural unit with a thickness of 18.4 A.
63 citations
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IBM1
TL;DR: In this article, a semiquantitative technique for estimating the limits of the critical current density in polycrystalline high-temperature superconductors is presented, based on the transport properties of single grain boundaries.
Abstract: A semiquantitative technique for estimating the limits of the critical current density in polycrystalline high-temperature superconductors is presented. This technique is based on the transport properties of single grain boundaries. Various factors essential in deducing the critical current density of polycrystalline high-Tc materials from the characteristics of single grain boundaries are discussed. The results for tectured, polycrystalline YBa2Cu3O7 fibers are reported, and the influence of the microstructure on their critical current density is discussed.
63 citations
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63 citations