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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
K. Ishida1, Yoshio Kitaoka1, T. Yoshitomi1, N. Ogata1, T. Kamino1, Kunisuke Asayama1 
TL;DR: In this article, the superconducting properties of Zn-doped YBa2Cu3O7 have been investigated by the 63Cu-NQR and -NMR technique.
Abstract: The superconducting properties of Zn-doped YBa2Cu3O7 have been investigated by the 63Cu-NQR and -NMR technique. Both the Knight shift K and the nuclear-spin-lattice relaxation time T1 were measured by using the oriented powder. The residual spin Knight shift of 63Cu at 4.2 K increases appreciably with increasing Zn-content from x=0.01 to 0.02. Correspondingly, the T1T=constant law holds at low temperatures far below Tc=79 K and 68 K for x=0.01 and 0.02 respectively, providing a clear sign of gapless superconductivity with finite density of states at the Fermi level, whereas the behavior of rapid decrease of 1/T1 just below Tc is almost unchanged even though Zn impurities are doped into the CuO2 plane. The NMR results in the Zn-doped and undoped YBa2Cu3O7 can be well interpreted by the combined effect of the gap zeros of lines at the Fermi surface originating from a d-wave pairing and the residual density of states at the Fermi level induced by non-magnetic Zn-impurities and by some imperfection of the crystal existing inevitably even in undoped YBa2Cu3O7.

92 citations

Journal ArticleDOI
TL;DR: In this article, the authors derived the surface impedance of superconductors from measured values of resonant frequencies and unloaded Q. The relation between the maximum surface current density of a superconductor, J/sub s/, and output power from a signal generator is derived.
Abstract: Perturbation formulas for TE/sub 011/-mode dielectric rod resonator and for a TE/sub 011/-mode circular cavity resonator are derived to determine the surface impedance Z/sub s/ of superconductors from measured values of resonant frequencies and unloaded Q. The relation between the maximum surface current density of a superconductor, J/sub s/, and output power from a signal generator is derived. On the basis of these analytical results, a measurement technique is proposed to evaluate the temperature and J/sub s/ dependencies of Z/sub s/ for superconductors. The measured results of the temperature dependence of Z/sub s/ for YBCO and copper plates are presented. From these results, it is verified that the dielectric resonator is suitable for measuring the surface reactance for YBCO. From these Z/sub s/ values the temperature dependences of the skin depth and the penetration depth and those of the complex conductivity are obtained on the basis of the two-fluid model. These measured values agree well with the theoretical curves. >

92 citations

Journal ArticleDOI
TL;DR: A principally experimental review of vortex behavior in high-temperature superconductors is presented in this article, where the reader is first introduced to the basic concepts needed to understand the magnetic properties of type II supercondors and the concepts of vortex melting, the vortex glass, vortex creep, etc.
Abstract: A principally experimental review of vortex behaviour in high-temperature superconductors is presented. The reader is first introduced to the basic concepts needed to understand the magnetic properties of type II superconductors. The concepts of vortex melting, the vortex glass, vortex creep, etc are also discussed briefly. The bulk part of the review relates the theoretical predictions proposed for the vortex system in high temperature superconductors to experimental findings. The review ends with an attempt to direct the reader to those areas which still require further clarification.

92 citations

Journal ArticleDOI
TL;DR: In this article, a new TbFeAs(O,F) and DyFeAs (O, F) superconductors with critical temperatures T(c) = 46 and 45 K and very high critical fields, >or=100 T, have been prepared at 1100-1150 degrees C and 10-12 GPa.

92 citations

Journal ArticleDOI
TL;DR: In this paper, the U = ∞ limit of the three-band Hubbard model with nearest-neighbor repulsion was studied using the slave-boson approach and the large-N expansion technique to order 1/N.
Abstract: The U=\ensuremath{\infty} limit of the three-band Hubbard model with nearest-neighbor repulsion V is studied using the slave-boson approach and the large-N expansion technique to order 1/N A charge-transfer instability is found as in weak-coupling theory The charge-transfer instability is always associated with a diverging compressibility leading to a phase separation Near the phase-separation, charge-transfer-instability region we find superconducting instabilities in the s- and d-wave channel The requirement for superconductivity is that V be on the scale of the Cu-O hopping as suggested by Varma, Schmitt-Rink, and Abrahams

92 citations


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